Consolidated Schedule of Investments In and Advances to Affiliates (Details)

v3.22.4

Consolidated Schedule of Investments In and Advances to Affiliates (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Schedule of Investments [Line Items]
Amount of Unrealized Gain/(Loss)		$ 24,816		$ 135,624		$ (5,622)
Control investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		(5,822)		6,494
Amount of Unrealized Gain/(Loss)		56,682		99,420
Amount of Interest, Fees or Dividends Credited to Income		155,967		122,277
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,489,257		1,113,725
Gross Additions		488,176		592,022
Gross Reductions		268,138		216,490
Ending balance		1,703,172		1,489,257		1,113,725
Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		(3,319)		17,181
Amount of Unrealized Gain/(Loss)		10,314		21,989
Amount of Interest, Fees or Dividends Credited to Income		54,963		51,278
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		549,214		366,301
Gross Additions		157,996		336,505
Gross Reductions		104,813		165,855
Ending balance		618,359		549,214		366,301
Investment, Identifier [Axis]: 2717 MH, L.P., LP Interests (2717 HPP-MS, L.P.) | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		0		0
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0		250
Gross Additions		248		0
Gross Reductions		0		250
Ending balance		248		0		250
Investment, Identifier [Axis]: 2717 MH, L.P., LP Interests (2717 MH, L.P.) | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		2,389		1,165
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		3,971		2,702
Gross Additions		3,581		1,269
Gross Reductions		0		0
Ending balance		7,552		3,971		2,702
Investment, Identifier [Axis]: AAC Holdings, Inc., Common Stock | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		(2,079)		(1,069)
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		2,079		3,148
Gross Additions		0		0
Gross Reductions		2,079		1,069
Ending balance		$ 0		$ 2,079		3,148
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate		18.00%	[1]	18.00%	[2]
PIK Rate		18.00%	[1]	8.00%	[2]
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		18.00%		18.00%
PIK Rate		18.00%		8.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		178		(217)
Amount of Interest, Fees or Dividends Credited to Income		2,032		1,817
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		9,794		9,187
Gross Additions		1,756		1,095
Gross Reductions		0		488
Ending balance		11,550		9,794		9,187
Investment, Identifier [Axis]: AAC Holdings, Inc., Warrants | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		(1,940)		(998)
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,940		2,938
Gross Additions		0		0
Gross Reductions		1,940		998
Ending balance		$ 0		$ 1,940		2,938
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[3],[4],[5],[6]	6.00%
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	10.20%
Spread	[3],[4],[5]	6.00%
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	10.58%
Spread	[3],[4],[5]	6.00%
Investment, Identifier [Axis]: ADS Tactical, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate		10.14%	[1],[5]	6.75%	[2],[7]
Spread		5.75%	[1],[5]	5.75%	[2],[7]
Investment, Identifier [Axis]: AFG Capital Group, LLC, Preferred Member Units | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		1,660		1,930
Amount of Interest, Fees or Dividends Credited to Income		200		200
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		7,740		5,810
Gross Additions		1,660		1,930
Gross Reductions		0		0
Ending balance		9,400		$ 7,740		5,810
Investment, Identifier [Axis]: AFG Capital Group, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate				10.00%
Investment, Identifier [Axis]: AFG Capital Group, LLC, Secured Debt | Affiliate investments
Schedule of Investments [Line Items]
Total Rate				10.00%
Amount of Realized Gain/(Loss)		0		$ 0
Amount of Unrealized Gain/(Loss)		0		0
Amount of Interest, Fees or Dividends Credited to Income		2		31
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		144		491
Gross Additions		0		0
Gross Reductions		144		347
Ending balance		$ 0		144		491
Investment, Identifier [Axis]: AMEREQUIP LLC., Secured Debt 1
Schedule of Investments [Line Items]
Spread	[3],[4],[5],[6]	7.40%
Investment, Identifier [Axis]: AMEREQUIP LLC., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	11.72%
Spread	[3],[4],[5]	7.40%
Investment, Identifier [Axis]: ASC Interests, LLC, Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0		0
Amount of Unrealized Gain/(Loss)		80		(400)
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		720		1,120
Gross Additions		80		0
Gross Reductions		0		400
Ending balance		800		$ 720		1,120
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt | Other controlled investments
Schedule of Investments [Line Items]
Total Rate				13.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				261
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 1,836		1,715
Gross Additions				121
Gross Reductions				0
Ending balance				$ 1,836		1,715
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		13.00%		13.00%
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt 1 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		13.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		36
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		200
Gross Additions		230
Gross Reductions		30
Ending balance		$ 400		$ 200
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		13.00%		13.00%
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt 2 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		13.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		266
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,636
Gross Additions		13
Gross Reductions		0
Ending balance		1,649		$ 1,636
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Preferred Member Units | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				0
Amount of Unrealized Gain/(Loss)				(733)
Amount of Interest, Fees or Dividends Credited to Income				0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 4,894		3,200
Gross Additions				4,894
Gross Reductions				3,200
Ending balance				4,894		3,200
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Preferred Member Units 1 | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		14.13%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		0
Gross Reductions		0
Ending balance		0		0
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Preferred Member Units 2 | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		(1,390)
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		4,894
Gross Additions		0
Gross Reductions		1,390
Ending balance		3,504		$ 4,894
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Secured Debt | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate				12.00%
Spread				10.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				691
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 4,736		4,873
Gross Additions				153
Gross Reductions				290
Ending balance				4,736		4,873
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Secured Debt 1 | Majority-owned investments
Schedule of Investments [Line Items]
Spread		10.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		6
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		(4)
Gross Additions		1
Gross Reductions		0
Ending balance		$ (3)		(4)
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Secured Debt 2 | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		14.13%
Spread		10.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		690
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		4,740
Gross Additions		85
Gross Reductions		280
Ending balance		4,545		4,740
Investment, Identifier [Axis]: ASK (Analytical Systems Keco Holdings, LLC), Warrants | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		0		(10)
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0		10
Gross Additions		0		0
Gross Reductions		0		10
Ending balance		$ 0		0		10
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[3],[5],[6]	5.50%
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	9.32%
Spread	[3],[4],[5]	5.50%
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	11.32%
Spread	[3],[4],[5]	7.50%
Investment, Identifier [Axis]: ATS Workholding, LLC, Preferred Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		0
Gross Reductions		0
Ending balance		0		$ 0
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[8],[9]			5.00%
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt | Other controlled investments
Schedule of Investments [Line Items]
Total Rate				5.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				(154)
Amount of Interest, Fees or Dividends Credited to Income				0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 3,005		3,347
Gross Additions				0
Gross Reductions				342
Ending balance				3,005		3,347
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[3],[10]	5.00%
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt 1 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		5.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		(620)
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,088
Gross Additions		188
Gross Reductions		642
Ending balance		$ 634		1,088
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[10]	5.00%
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt 2 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		5.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		(869)
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,917
Gross Additions		0
Gross Reductions		912
Ending balance		1,005		1,917
Investment, Identifier [Axis]: ATX Networks Corp., Common Stock | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		3,270
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		3,270
Gross Reductions		0
Ending balance		$ 3,270		$ 0
Investment, Identifier [Axis]: ATX Networks Corp., Secured Debt
Schedule of Investments [Line Items]
Total Rate		12.23%	[1],[5]	8.50%	[2],[7]
Spread		7.50%	[1],[5]	7.50%	[2],[7]
Investment, Identifier [Axis]: ATX Networks Corp., Secured Debt | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		12.23%
Spread		7.50%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		134
Amount of Interest, Fees or Dividends Credited to Income		758
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		7,092
Gross Additions		362
Gross Reductions		1,111
Ending balance		6,343		$ 7,092
Investment, Identifier [Axis]: ATX Networks Corp., Secured Debt 1 | Affiliate investments
Schedule of Investments [Line Items]
Total Rate				8.50%
Spread				7.50%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				168
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		7,092		0
Gross Additions				7,092
Gross Reductions				0
Ending balance				$ 7,092		0
Investment, Identifier [Axis]: ATX Networks Corp., Secured Debt 2 | Affiliate investments
Schedule of Investments [Line Items]
Total Rate				8.75%
Spread				6.25%
PIK Rate				1.50%
Amount of Realized Gain/(Loss)				$ (4,528)
Amount of Unrealized Gain/(Loss)				1,133
Amount of Interest, Fees or Dividends Credited to Income				0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 0		12,263
Gross Additions				1,521
Gross Reductions				13,784
Ending balance				$ 0		12,263
Investment, Identifier [Axis]: ATX Networks Corp., Unsecured Debt
Schedule of Investments [Line Items]
Total Rate		10.00%	[1]	10.00%	[2]
PIK Rate		10.00%	[1]	10.00%	[2]
Investment, Identifier [Axis]: ATX Networks Corp., Unsecured Debt | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		10.00%		10.00%
PIK Rate		10.00%		10.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		306		0
Amount of Interest, Fees or Dividends Credited to Income		329		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,963		0
Gross Additions		635		1,963
Gross Reductions		0		0
Ending balance		$ 2,598		$ 1,963		0
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7],[8]			7.50%
Spread	[7],[8]			6.50%
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[3],[4],[5],[6]	7.25%
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	12.17%
Spread	[3],[4],[5]	7.25%
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		13.23%	[3],[5]	10.00%	[7],[8]
Spread		8.50%	[3],[5]	8.50%	[7],[8]
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		13.23%	[3],[5]	14.00%	[7],[8]
Spread		8.50%	[3],[5]	12.50%	[7],[8]
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate	[3],[5]	16.17%
Spread	[3],[5]	12.50%
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[3],[5]	13.88%
Spread	[3],[5]	9.50%
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[5]	13.57%
Spread	[3],[5]	9.00%
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[3],[5],[11]	10.00%
Spread	[3],[5],[11]	6.00%
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[5],[11]	10.00%
Spread	[3],[5],[11]	7.50%
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7],[8]			7.00%
Spread	[7],[8]			6.00%
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Spread	[3],[5],[6]	6.00%
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[5]	11.12%
Spread	[3],[5]	6.00%
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7],[8]			9.00%
Spread	[7],[8]			8.00%
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	10.46%
Spread	[3],[4],[5]	6.75%
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	12.46%
Spread	[3],[4],[5]	8.75%
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		7.50%	[1],[10]	7.50%	[2],[7],[9],[12]
Spread		6.50%	[1],[10]	6.50%	[2],[7],[9],[12]
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		7.50%	[1],[5],[10]	7.50%	[2],[7],[9]
Spread		6.50%	[1],[5],[10]	6.50%	[2],[7],[9]
Investment, Identifier [Axis]: Amounts related to investments transferred to or from other 1940 Act classification during the period | Control investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 0		0
Gross Additions				0
Gross Reductions				0
Ending balance				0		0
Investment, Identifier [Axis]: Amounts related to investments transferred to or from other 1940 Act classification during the period | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				(694)
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				(11)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 0		(12,263)
Gross Additions				0
Gross Reductions				0
Ending balance				$ 0		(12,263)
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 1
Schedule of Investments [Line Items]
Total Rate		14.13%
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7]			12.00%
Spread	[7]			10.00%
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[5],[6]	10.00%
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[5]	14.13%
Spread	[5]	10.00%
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7],[8]			8.00%
Spread	[7],[8]			7.00%
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[3],[5]	13.41%
Spread	[3],[5]	9.00%
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[5]	13.56%
Spread	[3],[5]	9.00%
Investment, Identifier [Axis]: Archer Systems, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[3],[4],[5],[6]	6.50%
Investment, Identifier [Axis]: Archer Systems, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	10.92%
Spread	[3],[4],[5]	6.50%
Investment, Identifier [Axis]: Arrow International, Inc, Secured Debt
Schedule of Investments [Line Items]
Total Rate		10.36%	[3],[4],[5],[13]	9.18%	[7],[8],[14]
Spread		6.60%	[3],[4],[5],[13]	7.93%	[7],[8],[14]
Investment, Identifier [Axis]: BBB Tank Services, LLC, Member Units | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		0		(280)
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0		280
Gross Additions		0		0
Gross Reductions		0		280
Ending balance		$ 0		$ 0		280
Investment, Identifier [Axis]: BBB Tank Services, LLC, Preferred Stock (non-voting)
Schedule of Investments [Line Items]
Total Rate		15.00%		15.00%	[15]
PIK Rate	[15]			15.00%
Investment, Identifier [Axis]: BBB Tank Services, LLC, Preferred Stock (non-voting) | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		15.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		0		(162)
Amount of Interest, Fees or Dividends Credited to Income		0		11
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0		151
Gross Additions		0		11
Gross Reductions		0		162
Ending balance		0		$ 0		151
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt
Schedule of Investments [Line Items]
Total Rate	[7],[12]			12.00%
Spread	[7],[12]			11.00%
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt | Affiliate investments
Schedule of Investments [Line Items]
Total Rate				12.00%
Spread				11.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				(2,242)
Amount of Interest, Fees or Dividends Credited to Income				612
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 2,507		4,722
Gross Additions				27
Gross Reductions				2,242
Ending balance				2,507		4,722
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt 1
Schedule of Investments [Line Items]
Total Rate	[5],[16]	15.12%
Spread	[5],[16]	11.00%
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt 1 | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		15.12%
Spread		11.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		105
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		800
Gross Additions		0
Gross Reductions		0
Ending balance		$ 800		800
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt 2
Schedule of Investments [Line Items]
Total Rate	[5],[16]	15.12%
Spread	[5],[16]	11.00%
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt 2 | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		15.12%
Spread		11.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		379
Amount of Interest, Fees or Dividends Credited to Income		527
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,707
Gross Additions		379
Gross Reductions		0
Ending balance		2,086		1,707
Investment, Identifier [Axis]: Barfly Ventures, LLC, Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		1,390		346
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,930		1,584
Gross Additions		1,390		346
Gross Reductions		0		0
Ending balance		$ 3,320		$ 1,930		1,584
Investment, Identifier [Axis]: Barfly Ventures, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		7.00%	[3]	7.00%	[8]
Investment, Identifier [Axis]: Barfly Ventures, LLC, Secured Debt | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		7.00%		7.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		0		0
Amount of Interest, Fees or Dividends Credited to Income		51		49
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		710		343
Gross Additions		1		367
Gross Reductions		0		0
Ending balance		711		710		343
Investment, Identifier [Axis]: Batjer TopCo, LLC, Preferred Stock | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		631
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		4,095
Gross Reductions		0
Ending balance		4,095		0
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 1 | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		5
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		451
Gross Reductions		459
Ending balance		(8)		0
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 2 | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		0
Gross Reductions		0
Ending balance		$ 0		0
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate		11.00%
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 3 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		11.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		1,139
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		10,933
Gross Reductions		0
Ending balance		$ 10,933		$ 0
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 1
Schedule of Investments [Line Items]
Total Rate		8.00%	[3],[17],[18]	16.00%	[8],[15],[19]
PIK Rate		8.00%	[3],[17],[18]	16.00%	[8],[15],[19]
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 2
Schedule of Investments [Line Items]
Total Rate	[8],[19]			8.00%
PIK Rate		16.00%	[3],[6],[17],[18]	8.00%	[8],[19]
Investment, Identifier [Axis]: Berry Aviation, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate		12.00%	[3]	12.00%	[8]
Spread	[3]	10.50%
PIK Rate		1.50%	[3]	1.50%	[8]
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Spread	[3],[4],[5],[6]	1.00%
PIK Rate	[3],[4],[5],[6]	6.00%
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	11.40%
Spread	[3],[4],[5]	1.00%
PIK Rate	[3],[4],[5]	6.00%
Investment, Identifier [Axis]: Binswanger Enterprises, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7],[8]			9.50%
Spread	[7],[8]			8.50%
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate	[2],[7]			10.00%
Spread	[2],[7]			8.50%
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Spread	[1],[5],[6]	8.50%
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[1],[5]	12.94%
Spread	[1],[5]	8.50%
Investment, Identifier [Axis]: Boccella Precast Products LLC, Member Units | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		(1,860)		(1,210)
Amount of Interest, Fees or Dividends Credited to Income		66		398
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		4,830		6,040
Gross Additions		0		0
Gross Reductions		1,860		1,210
Ending balance		$ 2,970		$ 4,830		6,040
Investment, Identifier [Axis]: Boccella Precast Products LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		10.00%		10.00%
Investment, Identifier [Axis]: Boccella Precast Products LLC, Secured Debt | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		10.00%		10.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		0		0
Amount of Interest, Fees or Dividends Credited to Income		32		9
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		320		0
Gross Additions		0		320
Gross Reductions		0		0
Ending balance		320		$ 320		0
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Class A Preferred Member Units
Schedule of Investments [Line Items]
Total Rate	[15]			14.00%
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Class A Preferred Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		$ 0
Amount of Unrealized Gain/(Loss)		0		0
Amount of Interest, Fees or Dividends Credited to Income		2,466		1,427
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		10,194		10,194
Gross Additions		0		0
Gross Reductions		10,194		0
Ending balance		$ 0		$ 10,194		10,194
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Class B Preferred Member Units
Schedule of Investments [Line Items]
Total Rate		8.00%	[17]	8.00%	[15]
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Class B Preferred Member Units | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		8.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		8,250		9,170
Amount of Interest, Fees or Dividends Credited to Income		1,210		3,100
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		23,170		14,000
Gross Additions		8,250		9,170
Gross Reductions		0		0
Ending balance		$ 31,420		$ 23,170		14,000
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		13.39%	[4],[5],[20]	10.50%	[7]
Spread		9.26%	[4],[5],[20]	9.00%	[7]
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt | Other controlled investments
Schedule of Investments [Line Items]
Total Rate				10.50%
Spread				9.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				313
Amount of Interest, Fees or Dividends Credited to Income				3,686
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 39,000		27,225
Gross Additions				12,275
Gross Reductions				500
Ending balance				39,000		27,225
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt 1 | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		23
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		0
Gross Reductions		0
Ending balance		$ 0		0
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt 2 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		13.39%
Spread		9.26%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		305
Amount of Interest, Fees or Dividends Credited to Income		9,164
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		39,000
Gross Additions		60,194
Gross Reductions		0
Ending balance		99,194		39,000
Investment, Identifier [Axis]: Bond-Coat, Inc., Common Stock | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				(2,320)
Amount of Unrealized Gain/(Loss)				4,310
Amount of Interest, Fees or Dividends Credited to Income				0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 0		2,040
Gross Additions				4,310
Gross Reductions				6,350
Ending balance				$ 0		2,040
Investment, Identifier [Axis]: Brainworks Software, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7],[8],[9],[12]			12.50%
Spread	[7],[8],[9],[12]			9.25%
Investment, Identifier [Axis]: Brainworks Software, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[3],[5],[10],[16]	12.50%
Spread	[3],[5],[10],[16]	9.25%
Investment, Identifier [Axis]: Brainworks Software, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[5],[10],[16]	12.50%
Spread	[3],[5],[10],[16]	9.25%
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		(630)		1,860
Amount of Interest, Fees or Dividends Credited to Income		828		927
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		7,710		5,850
Gross Additions		0		1,860
Gross Reductions		630		0
Ending balance		$ 7,080		$ 7,710		5,850
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		14.12%	[5]	11.00%	[7]
Spread		10.00%	[5]	10.00%	[7]
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		14.12%		11.00%
Spread		10.00%		10.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		0		0
Amount of Interest, Fees or Dividends Credited to Income		862		940
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		8,037		8,513
Gross Additions		23		20
Gross Reductions		2,096		496
Ending balance		5,964		8,037		8,513
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Preferred Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		100
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,000
Gross Additions		0
Gross Reductions		0
Ending balance		1,000		$ 1,000
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Preferred Member Units 1 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate				13.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				1,705
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		9,813		9,401
Gross Additions				412
Gross Reductions				0
Ending balance				9,813		9,401
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Preferred Member Units 2 | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				100
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 1,000		1,000
Gross Additions				0
Gross Reductions				0
Ending balance				$ 1,000		1,000
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		13.00%		13.00%
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Secured Debt 1 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		13.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		1,162
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		8,813
Gross Additions		0
Gross Reductions		0
Ending balance		$ 8,813		$ 8,813
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		13.00%	[18]	13.00%	[19]
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Secured Debt 2 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		13.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		132
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,000
Gross Additions		0
Gross Reductions		0
Ending balance		1,000		$ 1,000
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				0
Amount of Unrealized Gain/(Loss)				840
Amount of Interest, Fees or Dividends Credited to Income				0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		4,060		3,220
Gross Additions				840
Gross Reductions				0
Ending balance				4,060		3,220
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants 1 | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		117
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,712
Gross Additions		116
Gross Reductions		0
Ending balance		1,828		1,712
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants 2 | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		163
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		2,348
Gross Additions		164
Gross Reductions		0
Ending balance		2,512		2,348
Investment, Identifier [Axis]: Brightwood Capital Fund Investments - Fund V, LP Interests (Brightwood Capital Fund V, LP) | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 1,000		0
Gross Additions				1,000
Gross Reductions				0
Ending balance				$ 1,000		0
Investment, Identifier [Axis]: Buca C, LLC, Preferred Member Units
Schedule of Investments [Line Items]
Total Rate		6.00%		6.00%
PIK Rate		6.00%		6.00%
Investment, Identifier [Axis]: Buca C, LLC, Preferred Member Units | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		6.00%
PIK Rate		6.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		0
Gross Reductions		0
Ending balance		$ 0		$ 0
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		9.00%		10.25%	[7],[12]
Spread	[7],[12]			9.25%
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		9.00%		10.25%
Spread				9.25%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		103		(373)
Amount of Interest, Fees or Dividends Credited to Income		1,894		1,782
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		14,370		14,256
Gross Additions		103		487
Gross Reductions		2,136		373
Ending balance		$ 12,337		$ 14,370		14,256
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[7],[8]			6.00%
Spread		5.00%	[3],[5],[6]	5.00%	[7],[8]
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		8.91%	[3],[5]	6.00%	[7],[8]
Spread		5.00%	[3],[5]	5.00%	[7],[8]
Investment, Identifier [Axis]: CAI Software LLC, Member Units | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				$ 10,252
Amount of Unrealized Gain/(Loss)				(5,095)
Amount of Interest, Fees or Dividends Credited to Income				2,380
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 0		7,190
Gross Additions				0
Gross Reductions				7,190
Ending balance				$ 0		7,190
Investment, Identifier [Axis]: CAI Software LLC, Secured Debt | Affiliate investments
Schedule of Investments [Line Items]
Total Rate				12.50%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				(340)
Amount of Interest, Fees or Dividends Credited to Income				7,570
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0		47,474
Gross Additions				23,940
Gross Reductions				71,414
Ending balance				0		47,474
Investment, Identifier [Axis]: CBT Nuggets, LLC, Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		(1,620)		4,540
Amount of Interest, Fees or Dividends Credited to Income		3,305		2,308
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		50,620		46,080
Gross Additions		0		4,540
Gross Reductions		1,618		0
Ending balance		49,002		50,620		46,080
Investment, Identifier [Axis]: CMS Minerals Investments, Member Units | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		230		691
Amount of Interest, Fees or Dividends Credited to Income		198		50
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,974		1,624
Gross Additions		230		691
Gross Reductions		534		341
Ending balance		$ 1,670		$ 1,974		1,624
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		11.99%	[3],[5],[21]	9.28%	[8],[22]
Spread	[3],[5],[21]	8.50%
PIK Rate		0.01%	[3],[5],[21]	0.22%	[8],[22]
Investment, Identifier [Axis]: Café Brazil, LLC, Member Units | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		(360)		540
Amount of Interest, Fees or Dividends Credited to Income		178		1,012
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		2,570		2,030
Gross Additions		0		540
Gross Reductions		360		0
Ending balance		2,210		2,570		2,030
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				0
Amount of Unrealized Gain/(Loss)				7,034
Amount of Interest, Fees or Dividends Credited to Income				1,505
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		22,785		14,496
Gross Additions				8,289
Gross Reductions				0
Ending balance				$ 22,785		14,496
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units 1
Schedule of Investments [Line Items]
Total Rate	[15]			15.00%
PIK Rate	[15]			15.00%
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units 1 | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		12,220
Amount of Interest, Fees or Dividends Credited to Income		250
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		13,275
Gross Additions		12,220
Gross Reductions		0
Ending balance		$ 25,495		$ 13,275
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units 2
Schedule of Investments [Line Items]
Total Rate	[17]	15.00%
PIK Rate	[17]	15.00%
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units 2 | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		15.00%
PIK Rate		15.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		933
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		9,510
Gross Additions		933
Gross Reductions		6,449
Ending balance		$ 3,994		$ 9,510
Investment, Identifier [Axis]: California Splendor Holdings LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		13.75%	[5]	11.00%	[7]
Spread		10.00%	[5]	10.00%	[7]
Investment, Identifier [Axis]: California Splendor Holdings LLC, Secured Debt | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		13.75%		11.00%
Spread		10.00%		10.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		49		36
Amount of Interest, Fees or Dividends Credited to Income		3,454		3,381
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		27,915		35,833
Gross Additions		85		211
Gross Reductions		0		8,129
Ending balance		$ 28,000		$ 27,915		35,833
Investment, Identifier [Axis]: Camin Cargo Control, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate		10.88%	[1],[5]	7.50%	[2],[7]
Spread		6.50%	[1],[5]	6.50%	[2],[7]
Investment, Identifier [Axis]: Career Team Holdings, LLC, Class A Common Units | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 4,500		0
Gross Additions				4,500
Gross Reductions				0
Ending balance				4,500		0
Investment, Identifier [Axis]: Career Team Holdings, LLC, Common Stock | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		4,500
Gross Additions		0
Gross Reductions		0
Ending balance		4,500		$ 4,500
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate				12.50%
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt | Affiliate investments
Schedule of Investments [Line Items]
Total Rate				12.50%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				513
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 20,050		0
Gross Additions				20,050
Gross Reductions				0
Ending balance				20,050		0
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[5],[6]	6.00%
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 1 | Affiliate investments
Schedule of Investments [Line Items]
Spread		6.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		10
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		621
Gross Reductions		630
Ending balance		$ (9)		0
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		12.50%
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 2 | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		12.50%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		2,607
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		20,050
Gross Additions		40
Gross Reductions		0
Ending balance		$ 20,090		20,050
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Spread	[3],[5],[6]	6.00%
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[5]	10.73%
Spread	[3],[5]	6.00%
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 3
Schedule of Investments [Line Items]
Total Rate	[3],[5]	10.48%
Spread	[3],[5]	5.75%
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Preferred Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0		0
Amount of Unrealized Gain/(Loss)		2,578		(320)
Amount of Interest, Fees or Dividends Credited to Income		120		120
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		5,840		6,160
Gross Additions		2,860		0
Gross Reductions		0		320
Ending balance		8,700		$ 5,840		6,160
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7]			12.00%
Spread	[7]			10.00%
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt | Other controlled investments
Schedule of Investments [Line Items]
Total Rate				12.00%
Spread				10.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				(507)
Amount of Interest, Fees or Dividends Credited to Income				1,266
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 8,864		11,549
Gross Additions				33
Gross Reductions				2,718
Ending balance				8,864		11,549
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[5],[6]	9.00%
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 1 | Other controlled investments
Schedule of Investments [Line Items]
Spread		9.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		28
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		1,440
Gross Reductions		1,440
Ending balance		$ 0		0
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[5]	13.13%
Spread	[5]	9.00%
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		13.13%
Spread		9.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		507
Amount of Interest, Fees or Dividends Credited to Income		1,767
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		8,864
Gross Additions		6,476
Gross Reductions		386
Ending balance		14,954		8,864
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				0
Amount of Unrealized Gain/(Loss)				(3,660)
Amount of Interest, Fees or Dividends Credited to Income				3,922
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		25,680		29,340
Gross Additions				270
Gross Reductions				3,930
Ending balance				25,680		29,340
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 1 | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		(1,220)
Amount of Interest, Fees or Dividends Credited to Income		1,853
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		24,140
Gross Additions		0
Gross Reductions		1,220
Ending balance		22,920		24,140
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 2 | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		719
Amount of Interest, Fees or Dividends Credited to Income		78
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,540
Gross Additions		1,170
Gross Reductions		0
Ending balance		2,710		$ 1,540
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7]			9.00%
Spread	[7]			8.00%
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt | Other controlled investments
Schedule of Investments [Line Items]
Total Rate				9.00%
Spread				8.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				2
Amount of Interest, Fees or Dividends Credited to Income				1,544
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 17,817		15,212
Gross Additions				4,001
Gross Reductions				1,396
Ending balance				17,817		15,212
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[5],[6]	6.00%
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 1 | Other controlled investments
Schedule of Investments [Line Items]
Spread		6.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		8
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		0
Gross Reductions		0
Ending balance		$ 0		0
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[5]	12.13%
Spread	[5]	8.00%
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 2 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		12.13%
Spread		8.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		(68)
Amount of Interest, Fees or Dividends Credited to Income		1,845
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		17,817
Gross Additions		68
Gross Reductions		940
Ending balance		16,945		17,817
Investment, Identifier [Axis]: Chandler Signs Holdings, LLC, Class A Units | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		1,330		(1,000)
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		460		1,460
Gross Additions		1,330		0
Gross Reductions		0		1,000
Ending balance		$ 1,790		460		1,460
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5],[23]	10.72%
Spread	[3],[4],[5],[23]	6.25%
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5],[24]	10.71%
Spread	[3],[4],[5],[24]	6.25%
Investment, Identifier [Axis]: Charlotte Russe, Inc, Common Stock | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				(3,141)
Amount of Unrealized Gain/(Loss)				3,141
Amount of Interest, Fees or Dividends Credited to Income				0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 0		0
Gross Additions				3,141
Gross Reductions				3,141
Ending balance				0		0
Investment, Identifier [Axis]: Charps, LLC, Preferred Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		(650)		1,907
Amount of Interest, Fees or Dividends Credited to Income		764		4,839
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		13,990		10,520
Gross Additions		0		3,470
Gross Reductions		650		0
Ending balance		13,340		$ 13,990		10,520
Investment, Identifier [Axis]: Charps, LLC, Secured Debt | Other controlled investments
Schedule of Investments [Line Items]
Total Rate				15.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 0		669
Gross Additions				0
Gross Reductions				669
Ending balance				$ 0		669
Investment, Identifier [Axis]: Charps, LLC, Unsecured Debt
Schedule of Investments [Line Items]
Total Rate		10.00%		10.00%
Investment, Identifier [Axis]: Charps, LLC, Unsecured Debt | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		10.00%		10.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		(44)		260
Amount of Interest, Fees or Dividends Credited to Income		613		1,007
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		5,694		8,475
Gross Additions		44		559
Gross Reductions		44		3,340
Ending balance		5,694		$ 5,694		8,475
Investment, Identifier [Axis]: Chisholm Energy Holdings, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7],[8]			7.75%
Spread	[7],[8]			6.25%
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				1,640
Amount of Interest, Fees or Dividends Credited to Income				2,391
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		10,780		9,140
Gross Additions				1,640
Gross Reductions				0
Ending balance				10,780		9,140
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units 1 | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		(2,030)
Amount of Interest, Fees or Dividends Credited to Income		758
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		10,250
Gross Additions		0
Gross Reductions		2,030
Ending balance		8,220		10,250
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units 2 | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		80
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		530
Gross Additions		80
Gross Reductions		0
Ending balance		$ 610		530
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt | Majority-owned investments
Schedule of Investments [Line Items]
Spread		9.00%
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt - SF 9.00% | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		0
Gross Reductions		0
Ending balance		$ 0		$ 0
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[7]			10.50%
Spread		9.00%	[4],[5],[6]	9.50%	[7]
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1 | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		13.23%		10.00%
Spread		9.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				110
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 1,071		1,100
Gross Additions				0
Gross Reductions				29
Ending balance				1,071		1,100
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1 - 13.23% | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		1,255
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		10,401
Gross Additions		39
Gross Reductions		0
Ending balance		$ 10,440		$ 10,401
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		13.23%	[4],[5]	10.00%
Spread	[4],[5]	9.00%
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 2 | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		10.00%		10.50%
Spread				9.50%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				1,167
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 10,401		10,853
Gross Additions				(52)
Gross Reductions				400
Ending balance				10,401		10,853
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 2 - 10.00% | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		107
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		1,071
Gross Additions		1
Gross Reductions		33
Ending balance		$ 1,039		$ 1,071
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate		10.00%
Investment, Identifier [Axis]: Clarius BIGS, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		15.00%	[3],[10],[16]	15.00%	[8],[9],[12]
PIK Rate		15.00%	[3],[10],[16]	15.00%	[8],[9],[12]
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Preferred Member Units | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		9,380		5,750
Amount of Interest, Fees or Dividends Credited to Income		1,711		1,070
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		15,260		9,510
Gross Additions		9,377		5,750
Gross Reductions		0		0
Ending balance		$ 24,637		$ 15,260		9,510
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		9.75%	[5]	7.00%	[7]
Spread		6.00%	[5]	6.00%	[7]
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt 1 | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		9.75%		7.00%
Spread		6.00%		6.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		0		0
Amount of Interest, Fees or Dividends Credited to Income		639		83
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		4,000		0
Gross Additions		11,720		4,000
Gross Reductions		11,160		0
Ending balance		$ 4,560		$ 4,000		0
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		8.00%		8.00%
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt 2 | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		8.00%		8.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		(43)		(82)
Amount of Interest, Fees or Dividends Credited to Income		1,606		2,210
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		19,274		24,800
Gross Additions		43		82
Gross Reductions		43		5,608
Ending balance		19,274		19,274		24,800
Investment, Identifier [Axis]: Cody Pools, Inc., Preferred Member Units | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		10,540		32,700
Amount of Interest, Fees or Dividends Credited to Income		4,015		3,100
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		47,640		14,940
Gross Additions		10,540		32,700
Gross Reductions		0		0
Ending balance		58,180		$ 47,640		14,940
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7]			12.25%
Spread	[7]			10.50%
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate				12.25%
Spread				10.50%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				242
Amount of Interest, Fees or Dividends Credited to Income				2,357
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 42,484		14,216
Gross Additions				32,737
Gross Reductions				4,469
Ending balance				42,484		14,216
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[5]	15.38%
Spread	[5]	10.50%
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt 1 | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		15.38%
Spread		10.50%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		19
Amount of Interest, Fees or Dividends Credited to Income		119
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		(13)
Gross Additions		4,971
Gross Reductions		3,496
Ending balance		$ 1,462		(13)
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[5]	15.38%
Spread	[5]	10.50%
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt 2 | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		15.38%
Spread		10.50%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		(86)
Amount of Interest, Fees or Dividends Credited to Income		5,615
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		42,497
Gross Additions		86
Gross Reductions		1,782
Ending balance		40,801		42,497
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		30		1,450
Amount of Interest, Fees or Dividends Credited to Income		1,397		1,480
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		9,130		0
Gross Additions		30		9,130
Gross Reductions		0		0
Ending balance		9,160		$ 9,130		0
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate				12.00%
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt | Other controlled investments
Schedule of Investments [Line Items]
Total Rate				12.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				0
Amount of Interest, Fees or Dividends Credited to Income				2,705
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		24,351		0
Gross Additions				24,981
Gross Reductions				630
Ending balance				24,351		0
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 1 | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		48
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		1,600
Gross Reductions		1,600
Ending balance		$ 0		0
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		12.00%
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt 2 | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		12.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		2,953
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		24,351
Gross Additions		60
Gross Reductions		1,260
Ending balance		23,151		24,351
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Preferred Member Units | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		7,830		5,220
Amount of Interest, Fees or Dividends Credited to Income		632		474
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		12,000		6,780
Gross Additions		7,830		5,220
Gross Reductions		0		0
Ending balance		19,830		$ 12,000		6,780
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7]			10.00%
Spread	[7]			9.00%
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Secured Debt | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate				10.00%
Spread				9.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				(18)
Amount of Interest, Fees or Dividends Credited to Income				777
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 6,477		7,954
Gross Additions				18
Gross Reductions				1,495
Ending balance				6,477		7,954
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[5],[6],[16]	9.00%
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Secured Debt 1 | Majority-owned investments
Schedule of Investments [Line Items]
Spread		9.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		0
Gross Reductions		0
Ending balance		$ 0		0
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[5]	13.13%
Spread	[5]	9.00%
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Secured Debt 2 | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		13.13%
Spread		9.00%
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		(16)
Amount of Interest, Fees or Dividends Credited to Income		642
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		6,477
Gross Additions		16
Gross Reductions		1,252
Ending balance		$ 5,241		$ 6,477
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7],[8]			8.50%
Spread	[7],[8]			7.50%
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[3],[5],[25]	12.56%
Spread	[3],[5],[25]	8.00%
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[5]	12.56%
Spread	[3],[5]	8.00%
Investment, Identifier [Axis]: Congruent Credit Opportunities Funds, LP Interests (Congruent Credit Opportunities Fund III, LP) | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0
Amount of Unrealized Gain/(Loss)		(142)
Amount of Interest, Fees or Dividends Credited to Income		566
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		9,959
Gross Additions		0
Gross Reductions		2,302
Ending balance		7,657		$ 9,959
Investment, Identifier [Axis]: Congruent Credit Opportunities Funds, LP Interests (Congruent Credit Opportunities Fund II, LP) | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				(4,449)
Amount of Unrealized Gain/(Loss)				4,355
Amount of Interest, Fees or Dividends Credited to Income				0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0		94
Gross Additions				4,355
Gross Reductions				4,449
Ending balance				0		94
Investment, Identifier [Axis]: Congruent Credit Opportunities Funds, LP Interests (Congruent Credit Opportunities Fund III, LP) | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				0
Amount of Unrealized Gain/(Loss)				(96)
Amount of Interest, Fees or Dividends Credited to Income				776
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		9,959		11,540
Gross Additions				0
Gross Reductions				1,581
Ending balance				9,959		11,540
Investment, Identifier [Axis]: Copper Trail Energy Fund I, LP - CTMH, LP Interests (CTMH, LP) | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		0		0
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		710		747
Gross Additions		0		0
Gross Reductions		122		37
Ending balance		588		710		747
Investment, Identifier [Axis]: Copper Trail Energy Fund I, LP, LP Interests (Copper Trail Energy Fund I, LP) | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)				(203)
Amount of Unrealized Gain/(Loss)				379
Amount of Interest, Fees or Dividends Credited to Income				378
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0		1,782
Gross Additions				379
Gross Reductions				2,161
Ending balance				0		1,782
Investment, Identifier [Axis]: DMA Industries, LLC, Preferred Equity | Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		1,316		0
Amount of Interest, Fees or Dividends Credited to Income		0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		5,944		0
Gross Additions		1,316		5,944
Gross Reductions		0		0
Ending balance		$ 7,260		$ 5,944		0
Investment, Identifier [Axis]: DMA Industries, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		12.00%		12.00%
Investment, Identifier [Axis]: DMA Industries, LLC, Secured Debt | Affiliate investments
Schedule of Investments [Line Items]
Total Rate		12.00%		12.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		165		0
Amount of Interest, Fees or Dividends Credited to Income		2,621		521
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		20,993		0
Gross Additions		207		20,993
Gross Reductions		0		0
Ending balance		$ 21,200		$ 20,993		0
Investment, Identifier [Axis]: DTE Enterprises, LLC, Class A Preferred Member Units
Schedule of Investments [Line Items]
Total Rate		8.00%	[3]	8.00%	[8]
PIK Rate		8.00%	[3]	8.00%	[8]
Investment, Identifier [Axis]: DTE Enterprises, LLC, Class AA Preferred Member Units (non-voting)
Schedule of Investments [Line Items]
Total Rate		10.00%	[3],[17]	10.00%	[7],[8]
PIK Rate		10.00%	[3],[17]	10.00%	[7],[8]
Investment, Identifier [Axis]: DTE Enterprises, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[7],[8]			9.50%
Spread	[7],[8]			8.00%
Investment, Identifier [Axis]: DTE Enterprises, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[3],[5],[6]	7.50%
Investment, Identifier [Axis]: DTE Enterprises, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[3],[5]	12.24%
Spread	[3],[5]	7.50%
Investment, Identifier [Axis]: Dalton US Inc., Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	11.90%
Spread	[3],[4],[5]	8.00%
Investment, Identifier [Axis]: Dalton US Inc., Secured Debt 2
Schedule of Investments [Line Items]
Spread	[3],[5],[6]	8.00%
Investment, Identifier [Axis]: Dalton US Inc., Secured Debt 3
Schedule of Investments [Line Items]
Total Rate	[3],[4],[5]	12.56%
Spread	[3],[4],[5]	8.00%
Investment, Identifier [Axis]: Darr Equipment LP, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[8]			12.50%
PIK Rate	[8]			1.00%
Investment, Identifier [Axis]: Datacom, LLC, Preferred Member Units | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 0		$ (7,324)
Amount of Unrealized Gain/(Loss)		60		7,324
Amount of Interest, Fees or Dividends Credited to Income		96		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		2,610		0
Gross Additions		60		9,934
Gross Reductions		0		7,324
Ending balance		$ 2,670		$ 2,610		0
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate				5.00%
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		7.50%
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 1 | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		7.50%		5.00%
Amount of Realized Gain/(Loss)				$ 0
Amount of Unrealized Gain/(Loss)				(628)
Amount of Interest, Fees or Dividends Credited to Income				793
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 7,668		0
Gross Additions				8,404
Gross Reductions				736
Ending balance				7,668		0
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 1 - 7.50% | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		0
Amount of Interest, Fees or Dividends Credited to Income		4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		0
Gross Additions		223
Gross Reductions		0
Ending balance		$ 223		$ 0
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		7.50%
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 2 | Majority-owned investments
Schedule of Investments [Line Items]
Total Rate		7.50%		8.00%
Amount of Realized Gain/(Loss)				$ (3,601)
Amount of Unrealized Gain/(Loss)				2,130
Amount of Interest, Fees or Dividends Credited to Income				1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		$ 0		12,146
Gross Additions				2,130
Gross Reductions				14,276
Ending balance				0		12,146
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt 2 - 7.50% | Majority-owned investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0
Amount of Unrealized Gain/(Loss)		228
Amount of Interest, Fees or Dividends Credited to Income		829
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		7,668
Gross Additions		391
Gross Reductions		270
Ending balance		7,789		7,668
Investment, Identifier [Axis]: Digital Products Holdings LLC, Preferred Member Units | Other controlled investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		0		0
Amount of Unrealized Gain/(Loss)		0		0
Amount of Interest, Fees or Dividends Credited to Income		200		200
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance		9,835		9,835
Gross Additions		0		0
Gross Reductions		0		0
Ending balance		$ 9,835		$ 9,835		9,835
Investment, Identifier [Axis]: Digital Products Holdings LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		14.13%	[5]	11.00%	[7]
Spread		10.00%	[5]	10.00%	[7]
Investment, Identifier [Axis]: Digital Products Holdings LLC, Secured Debt | Other controlled investments
Schedule of Investments [Line Items]
Total Rate		14.13%		11.00%
Spread		10.00%		10.00%
Amount of Realized Gain/(Loss)		$ 0		$ 0
Amount of Unrealized Gain/(Loss)		0		0
Amount of Interest, Fees or Dividends Credited to Income		1,991		1,978
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance</