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

v3.23.3

Consolidated Schedule of Investments In and Advances to Affiliates (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022	Dec. 31, 2022		Dec. 31, 2021
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ 664		$ 5,031	$ (103,223)		$ 3,302
Amount of Unrealized Gain/(Loss)		27,011		(10,081)	167,070		(19,922)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[1]				4,102,177
Ending balance	[2]	4,294,722			4,294,722
Fair value		4,294,722	[2]		4,294,722	[2]		$ 4,102,177	[1]
Control investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		546		(5,822)	(50,532)		(5,822)
Amount of Unrealized Gain/(Loss)		29,838		7,517	122,779		20,618
Amount of Interest, Fees or Dividends Credited to Income					145,485		110,751
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					1,703,172	[1],[3]	1,489,257
Gross Additions					419,339		280,134
Gross Reductions					210,406		128,214
Ending balance		1,927,019	[2],[4]	1,599,429	1,927,019	[2],[4]	1,599,429
Fair value		1,927,019	[2],[4]	1,599,429	1,927,019	[2],[4]	1,599,429	1,703,172	[1],[3]	$ 1,489,257
Control investments | Midwest
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance		470,009		346,535	470,009		346,535
Fair value		$ 470,009		$ 346,535	$ 470,009		$ 346,535
Net assets, percentage		24.40%		21.70%	24.40%		21.70%
Control investments | Northeast
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance				$ 144,681			$ 144,681
Fair value				$ 144,681			$ 144,681
Net assets, percentage				9.00%			9.00%
Control investments | Southeast
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance		$ 53,155		$ 16,360	$ 53,155		$ 16,360
Fair value		$ 53,155		$ 16,360	$ 53,155		$ 16,360
Net assets, percentage		2.80%		1.00%	2.80%		1.00%
Control investments | Southwest
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance		$ 691,921		$ 593,513	$ 691,921		$ 593,513
Fair value		$ 691,921		$ 593,513	$ 691,921		$ 593,513
Net assets, percentage		35.90%		37.10%	35.90%		37.10%
Control investments | West
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance		$ 426,218		$ 498,340	$ 426,218		$ 498,340
Fair value		$ 426,218		$ 498,340	$ 426,218		$ 498,340
Net assets, percentage		22.10%		31.20%	22.10%		31.20%
Control investments | Northeast Region and Canada
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance		$ 285,716			$ 285,716
Fair value		$ 285,716			$ 285,716
Net assets, percentage		14.80%			14.80%
Affiliate investments
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)		$ (228)		$ 601	$ (16,495)		$ 1,340
Amount of Unrealized Gain/(Loss)		5,188		(1,069)	26,859		3,703
Amount of Interest, Fees or Dividends Credited to Income					53,722		38,300
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					618,359	[1],[5]	549,214
Gross Additions					191,033		92,606
Gross Reductions					228,536		56,642
Ending balance		565,942	[2],[6]	552,581	565,942	[2],[6]	552,581
Fair value		565,942	[2],[6]	552,581	565,942	[2],[6]	552,581	618,359	[1],[5]	549,214
Affiliate investments | Midwest
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance		78,619		67,491	78,619		67,491
Fair value		$ 78,619		$ 67,491	$ 78,619		$ 67,491
Net assets, percentage		13.90%		12.20%	13.90%		12.20%
Affiliate investments | Northeast
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance				$ 105,372			$ 105,372
Fair value				$ 105,372			$ 105,372
Net assets, percentage				19.10%			19.10%
Affiliate investments | Southeast
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance		$ 176,508		$ 196,507	$ 176,508		$ 196,507
Fair value		$ 176,508		$ 196,507	$ 176,508		$ 196,507
Net assets, percentage		31.20%		35.60%	31.20%		35.60%
Affiliate investments | Southwest
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance		$ 77,756		$ 99,261	$ 77,756		$ 99,261
Fair value		$ 77,756		$ 99,261	$ 77,756		$ 99,261
Net assets, percentage		13.70%		18.00%	13.70%		18.00%
Affiliate investments | West
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance		$ 134,388		$ 83,950	$ 134,388		$ 83,950
Fair value		$ 134,388		$ 83,950	$ 134,388		$ 83,950
Net assets, percentage		23.70%		15.20%	23.70%		15.20%
Affiliate investments | Northeast Region and Canada
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance		$ 98,671			$ 98,671
Fair value		$ 98,671			$ 98,671
Net assets, percentage		17.40%			17.40%
Investment, Identifier [Axis]: 2717 MH, L.P., LP Interests (2717 HPP-MS, L.P.)
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					67		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					248		0
Gross Additions					67		244
Gross Reductions					0		0
Ending balance		$ 315		$ 244	315		244
Fair value		315		244	315		244	248		0
Investment, Identifier [Axis]: 2717 MH, L.P., LP Interests (2717 MH, L.P.)
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					2,222		0
Amount of Unrealized Gain/(Loss)					(1,106)		1,979
Amount of Interest, Fees or Dividends Credited to Income					141		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					7,552		3,971
Gross Additions					2,796		3,171
Gross Reductions					4,452		0
Ending balance		5,896		7,142	5,896		7,142
Fair value		5,896		7,142	5,896		7,142	7,552		3,971
Investment, Identifier [Axis]: 423 HAR, LP, LP Interests (423 HAR, L.P.)
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					750
Gross Reductions					0
Ending balance		750			750
Fair value		750			750			0
Investment, Identifier [Axis]: AAC Holdings, Inc., Common Stock
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					0		(2,004)
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	[7]	2,079
Gross Additions					0		0
Gross Reductions					0		2,004
Ending balance		0	[8]	75	0	[8]	75
Fair value		$ 0	[8]	$ 75	0	[8]	$ 75	$ 0	[7]	2,079
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate				18.00%			18.00%	18.00%	[7]
PIK Rate				18.00%			18.00%	18.00%	[7]
Amount of Realized Gain/(Loss)							$ 0
Amount of Unrealized Gain/(Loss)							143
Amount of Interest, Fees or Dividends Credited to Income							1,492
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					$ 11,550	[7]	9,794
Gross Additions							1,182
Gross Reductions							0
Ending balance				$ 10,976			10,976
Fair value				10,976			10,976	$ 11,550	[7]	9,794
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[8]	18.00%			18.00%
PIK Rate	[8]	18.00%			18.00%
Amount of Realized Gain/(Loss)					$ 0
Amount of Unrealized Gain/(Loss)					(20)
Amount of Interest, Fees or Dividends Credited to Income					46
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					0
Gross Additions					394
Gross Reductions					15
Ending balance	[8]	$ 379			379
Fair value		$ 379	[8]		$ 379	[8]		0
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[8]	18.00%			18.00%
PIK Rate	[8]	18.00%			18.00%
Amount of Realized Gain/(Loss)					$ 0
Amount of Unrealized Gain/(Loss)					(671)
Amount of Interest, Fees or Dividends Credited to Income					1,739
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					11,550
Gross Additions					1,739
Gross Reductions					671
Ending balance	[8]	$ 12,618			12,618
Fair value		12,618	[8]		12,618	[8]		11,550
Investment, Identifier [Axis]: AAC Holdings, Inc., Warrants
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					0		(1,865)
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	[7],[9]	1,940
Gross Additions					0		0
Gross Reductions					0		1,865
Ending balance		0	[8],[10]	75	0	[8],[10]	75
Fair value		$ 0	[8],[10]	75	$ 0	[8],[10]	75	$ 0	[7],[9]	1,940
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[11],[12]	13.50%			13.50%
Spread		5.00%	[11],[12]		5.00%	[11],[12]		6.00%	[13],[14],[15],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15],[16]				$ (39)
Ending balance	[11],[12]	$ 647			647
Fair value		$ 647	[11],[12]		$ 647	[11],[12]		$ (39)	[13],[14],[15],[16]
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[13],[14],[15]							10.20%
Spread		6.00%	[11],[12],[17],[18]		6.00%	[11],[12],[17],[18]		6.00%	[13],[14],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15]				$ 741
Ending balance	[11],[12],[17],[18]	$ (28)			(28)
Fair value		$ (28)	[11],[12],[17],[18]		$ (28)	[11],[12],[17],[18]		$ 741	[13],[14],[15]
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate		11.42%	[11],[12],[17]		11.42%	[11],[12],[17]		10.58%	[13],[14],[15]
Spread		6.00%	[11],[12],[17]		6.00%	[11],[12],[17]		6.00%	[13],[14],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15]				$ 17,052
Ending balance	[11],[12],[17]	$ 19,864			19,864
Fair value		$ 19,864	[11],[12],[17]		$ 19,864	[11],[12],[17]		$ 17,052	[13],[14],[15]
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 4
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17]	11.42%			11.42%
Spread	[11],[12],[17]	6.00%			6.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17]	$ 1,379			$ 1,379
Fair value	[11],[12],[17]	$ 1,379			$ 1,379
Investment, Identifier [Axis]: ADS Tactical, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate		11.18%	[8],[12],[17]		11.18%	[8],[12],[17]		10.14%	[7],[15]
Spread		5.75%	[8],[12],[17]		5.75%	[8],[12],[17]		5.75%	[7],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[7],[15]				$ 18,969
Ending balance	[8],[12],[17]	$ 17,244			17,244
Fair value		17,244	[8],[12],[17]		17,244	[8],[12],[17]		$ 18,969	[7],[15]
Investment, Identifier [Axis]: AFG Capital Group, LLC, Preferred Member Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					7,200
Amount of Unrealized Gain/(Loss)					(8,200)
Amount of Interest, Fees or Dividends Credited to Income					0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[19]				9,400
Gross Additions					7,200
Gross Reductions					16,600
Ending balance		0			0
Fair value		0			0			9,400	[19]
Investment, Identifier [Axis]: AFG Capital Group, LLC, Preferred Member Units 1
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							2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance							144
Gross Additions							0
Gross Reductions							144
Ending balance				0			0
Fair value				0			0			144
Investment, Identifier [Axis]: AFG Capital Group, LLC, Preferred Member Units 2
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)							0
Amount of Unrealized Gain/(Loss)							1,040
Amount of Interest, Fees or Dividends Credited to Income							200
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance							7,740
Gross Additions							1,040
Gross Reductions							0
Ending balance				8,780			8,780
Fair value				8,780			8,780			7,740
Investment, Identifier [Axis]: AMEREQUIP LLC., Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13]				1,779
Ending balance	[11],[20]	1,930			1,930
Fair value		$ 1,930	[11],[20]		$ 1,930	[11],[20]		$ 1,779	[13]
Investment, Identifier [Axis]: AMEREQUIP LLC., Secured Debt 1
Schedule of Investments [Line Items]
Spread		7.40%	[11],[12],[17],[18]		7.40%	[11],[12],[17],[18]		7.40%	[13],[14],[15],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15],[16]				$ (137)
Ending balance	[11],[12],[17],[18]	$ (115)			(115)
Fair value		$ (115)	[11],[12],[17],[18]		$ (115)	[11],[12],[17],[18]		$ (137)	[13],[14],[15],[16]
Investment, Identifier [Axis]: AMEREQUIP LLC., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		12.87%	[11],[12],[17]		12.87%	[11],[12],[17]		11.72%	[13],[14],[15]
Spread		7.40%	[11],[12],[17]		7.40%	[11],[12],[17]		7.40%	[13],[14],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15]				$ 37,463
Ending balance	[11],[12],[17]	$ 32,116			32,116
Fair value		32,116	[11],[12],[17]		32,116	[11],[12],[17]		$ 37,463	[13],[14],[15]
Investment, Identifier [Axis]: ASC Interests, LLC, Member Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					(700)		80
Amount of Interest, Fees or Dividends Credited to Income					0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					800		720
Gross Additions					0		80
Gross Reductions					700		0
Ending balance		100		800	100		800
Fair value		100		$ 800	100		$ 800	800		720
Investment, Identifier [Axis]: ASC Interests, LLC, Preferred Member Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0
Amount of Unrealized Gain/(Loss)					88
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					250
Gross Reductions					0
Ending balance		250			250
Fair value		$ 250			$ 250			$ 0
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		13.00%		13.00%	13.00%		13.00%	13.00%
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					40		24
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					400		200
Gross Additions					0		130
Gross Reductions					0		30
Ending balance		$ 400		$ 300	400		300
Fair value		$ 400		$ 300	$ 400		$ 300	$ 400		200
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		13.00%		13.00%	13.00%		13.00%	13.00%
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					(53)		0
Amount of Interest, Fees or Dividends Credited to Income					163		211
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					1,649		1,636
Gross Additions					1		12
Gross Reductions					53		0
Ending balance		$ 1,597		$ 1,648	1,597		1,648
Fair value		1,597		1,648	1,597		1,648	$ 1,649		1,636
Investment, Identifier [Axis]: ATS Operating, LLC, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13]				660
Ending balance	[11]	570			570
Fair value		$ 570	[11]		$ 570	[11]		$ 660	[13]
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17]	12.01%			12.01%
Spread		6.50%	[11],[12],[17]		6.50%	[11],[12],[17]		5.50%	[13],[14],[15],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15],[16]				$ 0
Ending balance	[11],[12],[17]	$ 720			720
Fair value		$ 720	[11],[12],[17]		$ 720	[11],[12],[17]		$ 0	[13],[14],[15],[16]
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		11.01%	[11],[12],[17]		11.01%	[11],[12],[17]		9.32%	[13],[14],[15]
Spread		5.50%	[11],[12],[17]		5.50%	[11],[12],[17]		5.50%	[13],[14],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15]				$ 6,582
Ending balance	[11],[12],[17]	$ 6,660			6,660
Fair value		$ 6,660	[11],[12],[17]		$ 6,660	[11],[12],[17]		$ 6,582	[13],[14],[15]
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate		13.01%	[11],[12],[17]		13.01%	[11],[12],[17]		11.32%	[13],[14],[15]
Spread		7.50%	[11],[12],[17]		7.50%	[11],[12],[17]		7.50%	[13],[14],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15]				$ 6,593
Ending balance	[11],[12],[17]	$ 6,660			6,660
Fair value		6,660	[11],[12],[17]		6,660	[11],[12],[17]		$ 6,593	[13],[14],[15]
Investment, Identifier [Axis]: ATS Workholding, LLC, Preferred Member Units
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	[13]	0
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		0	[11]	0	0	[11]	0
Fair value		$ 0	[11]	$ 0	$ 0	[11]	$ 0	$ 0	[13]	0
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		5.00%	[11],[21]	5.00%	5.00%	[11],[21]	5.00%	5.00%	[13],[22]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					(414)		(411)
Amount of Interest, Fees or Dividends Credited to Income					0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					634	[13],[22]	1,088
Gross Additions					188		147
Gross Reductions					414		435
Ending balance		$ 408	[11],[21]	$ 800	408	[11],[21]	800
Fair value		$ 408	[11],[21]	$ 800	$ 408	[11],[21]	$ 800	$ 634	[13],[22]	1,088
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		5.00%	[11],[21]	5.00%	5.00%	[11],[21]	5.00%	5.00%	[13],[22]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					(417)		(576)
Amount of Interest, Fees or Dividends Credited to Income					0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					1,005	[13],[22]	1,917
Gross Additions					0		0
Gross Reductions					417		619
Ending balance		$ 588	[11],[21]	$ 1,298	588	[11],[21]	1,298
Fair value		588	[11],[21]	1,298	588	[11],[21]	1,298	$ 1,005	[13],[22]	1,917
Investment, Identifier [Axis]: ATX Networks Corp., Common Stock
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					3,248		0
Amount of Unrealized Gain/(Loss)					(3,270)		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					3,270	[7]	0
Gross Additions					3,248		0
Gross Reductions					6,518		0
Ending balance		0		0	0		0
Fair value		$ 0		$ 0	$ 0		$ 0	$ 3,270	[7]	0
Investment, Identifier [Axis]: ATX Networks Corp., Secured Debt
Schedule of Investments [Line Items]
Total Rate				11.14%			11.14%	12.23%	[7],[15]
Spread		7.50%		7.50%	7.50%		7.50%	7.50%	[7],[15]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					(134)		403
Amount of Interest, Fees or Dividends Credited to Income					886		562
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					6,343	[7],[15]	7,092
Gross Additions					575		631
Gross Reductions					6,918		1,016
Ending balance		$ 0		$ 6,707	0		6,707
Fair value		0		$ 6,707	0		$ 6,707	$ 6,343	[7],[15]	7,092
Investment, Identifier [Axis]: ATX Networks Corp., Unsecured Debt
Schedule of Investments [Line Items]
Total Rate				10.00%			10.00%	10.00%	[7]
PIK Rate				10.00%			10.00%	10.00%	[7]
Amount of Realized Gain/(Loss)					0		$ 0
Amount of Unrealized Gain/(Loss)					(306)		260
Amount of Interest, Fees or Dividends Credited to Income					1,160		242
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					2,598	[7]	1,963
Gross Additions					1,160		502
Gross Reductions					3,758		0
Ending balance		0		$ 2,465	0		2,465
Fair value		0		2,465	0		2,465	$ 2,598	[7]	1,963
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13]				406
Ending balance	[11]	892			892
Fair value		$ 892	[11]		$ 892	[11]		$ 406	[13]
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17]	12.67%			12.67%
Spread		7.25%	[11],[12],[17]		7.25%	[11],[12],[17]		7.25%	[13],[14],[15],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15],[16]				$ (57)
Ending balance	[11],[12],[17]	$ 1,428			1,428
Fair value		$ 1,428	[11],[12],[17]		$ 1,428	[11],[12],[17]		$ (57)	[13],[14],[15],[16]
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		12.80%	[11],[12],[17]		12.80%	[11],[12],[17]		12.17%	[13],[14],[15]
Spread		7.25%	[11],[12],[17]		7.25%	[11],[12],[17]		7.25%	[13],[14],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15]				$ 27,927
Ending balance	[11],[12],[17]	$ 23,898			23,898
Fair value		$ 23,898	[11],[12],[17]		$ 23,898	[11],[12],[17]		$ 27,927	[13],[14],[15]
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		13.94%	[11],[12],[17]		13.94%	[11],[12],[17]		13.23%	[13],[15]
Spread		8.50%	[11],[12],[17]		8.50%	[11],[12],[17]		8.50%	[13],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 1,678
Ending balance	[11],[12],[17]	$ 1,678			1,678
Fair value		$ 1,678	[11],[12],[17]		$ 1,678	[11],[12],[17]		$ 1,678	[13],[15]
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		13.94%	[11],[12],[17]		13.94%	[11],[12],[17]		13.23%	[13],[15]
Spread		8.50%	[11],[12],[17]		8.50%	[11],[12],[17]		8.50%	[13],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 9,891
Ending balance	[11],[12],[17]	$ 9,485			9,485
Fair value		$ 9,485	[11],[12],[17]		$ 9,485	[11],[12],[17]		$ 9,891	[13],[15]
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate		17.94%	[11],[12],[17]		17.94%	[11],[12],[17]		16.17%	[13],[15]
Spread		12.50%	[11],[12],[17]		12.50%	[11],[12],[17]		12.50%	[13],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 807
Ending balance	[11],[12],[17]	$ 764			764
Fair value		$ 764	[11],[12],[17]		$ 764	[11],[12],[17]		$ 807	[13],[15]
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[13],[15]							13.88%
Spread		7.50%	[11],[12],[17],[18]		7.50%	[11],[12],[17],[18]		9.50%	[13],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 14,618
Ending balance	[11],[12],[17],[18]	$ (2)			(2)
Fair value		$ (2)	[11],[12],[17],[18]		$ (2)	[11],[12],[17],[18]		$ 14,618	[13],[15]
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		12.99%	[11],[12],[17]		12.99%	[11],[12],[17]		13.57%	[13],[15]
Spread		7.50%	[11],[12],[17]		7.50%	[11],[12],[17]		9.00%	[13],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 4,368
Ending balance	[11],[12],[17]	$ 25,110			25,110
Fair value		25,110	[11],[12],[17]		25,110	[11],[12],[17]		$ 4,368	[13],[15]
Investment, Identifier [Axis]: Acumera, Inc., Warrants
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[23]	110			110
Fair value	[11],[23]	$ 110			$ 110
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		11.00%	[11],[12],[17],[24]		11.00%	[11],[12],[17],[24]		10.00%	[13],[15],[25]
Spread		7.00%	[11],[12],[17],[24]		7.00%	[11],[12],[17],[24]		6.00%	[13],[15],[25]
PIK Rate	[11],[12],[17],[24]	1.00%			1.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15],[25]				$ 4,729
Ending balance	[11],[12],[17],[24]	$ 7,029			7,029
Fair value		$ 7,029	[11],[12],[17],[24]		$ 7,029	[11],[12],[17],[24]		$ 4,729	[13],[15],[25]
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		11.00%	[11],[12],[17],[24]		11.00%	[11],[12],[17],[24]		10.00%	[13],[15],[25]
Spread		7.00%	[11],[12],[17],[24]		7.00%	[11],[12],[17],[24]		7.50%	[13],[15],[25]
PIK Rate	[11],[12],[17],[24]	1.00%			1.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15],[25]				$ 24,086
Ending balance	[11],[12],[17],[24]	$ 21,537			21,537
Fair value		$ 21,537	[11],[12],[17],[24]		$ 21,537	[11],[12],[17],[24]		$ 24,086	[13],[15],[25]
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Spread		6.00%	[11],[12],[18]		6.00%	[11],[12],[18]		6.00%	[13],[15],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15],[16]				$ (10)
Ending balance	[11],[12],[18]	$ (8)			(8)
Fair value		$ (8)	[11],[12],[18]		$ (8)	[11],[12],[18]		$ (10)	[13],[15],[16]
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		11.43%	[11],[12]		11.43%	[11],[12]		11.12%	[13],[15]
Spread		6.00%	[11],[12]		6.00%	[11],[12]		6.00%	[13],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 6,617
Ending balance	[11],[12]	$ 6,567			6,567
Fair value		$ 6,567	[11],[12]		$ 6,567	[11],[12]		$ 6,617	[13],[15]
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		15.15%	[11],[12],[17]		15.15%	[11],[12],[17]		10.46%	[13],[14],[15]
Spread		8.75%	[11],[12],[17]		8.75%	[11],[12],[17]		6.75%	[13],[14],[15]
PIK Rate		1.00%			1.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15]				$ 14,606
Ending balance	[11],[12],[17]	$ 4,747			4,747
Fair value		$ 4,747	[11],[12],[17]		$ 4,747	[11],[12],[17]		$ 14,606	[13],[14],[15]
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		15.15%	[11],[12],[17]		15.15%	[11],[12],[17]		12.46%	[13],[14],[15]
Spread		8.75%	[11],[12],[17]		8.75%	[11],[12],[17]		8.75%	[13],[14],[15]
PIK Rate	[11],[12],[17]	1.00%			1.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15]				$ 14,654
Ending balance	[11],[12],[17]	$ 7,712			7,712
Fair value		$ 7,712	[11],[12],[17]		$ 7,712	[11],[12],[17]		$ 14,654	[13],[14],[15]
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17],[21]	17.15%			17.15%
Spread	[11],[12],[17],[21]	10.75%			10.75%
PIK Rate	[11],[12],[17],[21]	1.00%			1.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17],[21]	$ 3,116			$ 3,116
Fair value	[11],[12],[17],[21]	$ 3,116			$ 3,116
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 4
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17],[21]	17.15%			17.15%
Spread	[11],[12],[17],[21]	10.75%			10.75%
PIK Rate	[11],[12],[17],[21]	1.00%			1.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17],[21]	$ 5,070			$ 5,070
Fair value	[11],[12],[17],[21]	$ 5,070			$ 5,070
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		7.50%	[8],[21],[26]		7.50%	[8],[21],[26]		7.50%	[7],[22]
Spread		6.50%	[8],[21],[26]		6.50%	[8],[21],[26]		6.50%	[7],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[7],[22]				$ 168
Ending balance	[8],[21],[26]	$ 134			134
Fair value		$ 134	[8],[21],[26]		$ 134	[8],[21],[26]		$ 168	[7],[22]
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		7.50%	[8],[12],[21],[26]		7.50%	[8],[12],[21],[26]		7.50%	[7],[15],[22]
Spread		6.50%	[8],[12],[21],[26]		6.50%	[8],[12],[21],[26]		6.50%	[7],[15],[22]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[7],[15],[22]				$ 808
Ending balance	[8],[12],[21],[26]	$ 647			647
Fair value		647	[8],[12],[21],[26]		647	[8],[12],[21],[26]		$ 808	[7],[15],[22]
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)					0		0
Amount of Unrealized Gain/(Loss)					0		139
Amount of Interest, Fees or Dividends Credited to Income					171		1,302
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					14,914		32,597
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		0		0	0		0
Fair value		0		0	0		0	14,914		32,597
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		0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					(171)		985
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					(14,914)		41,748
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		0		0	0		0
Fair value		$ 0		$ 0	$ 0		$ 0	$ (14,914)		41,748
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 1
Schedule of Investments [Line Items]
Total Rate		14.13%		12.63%	14.13%		12.63%	14.13%
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		0
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		$ 0		$ 0	0		0
Fair value		0		0	0		0	$ 0		0
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 2
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					1,076		(1,050)
Amount of Interest, Fees or Dividends Credited to Income					0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					3,504		4,894
Gross Additions					1,076		0
Gross Reductions					0		1,050
Ending balance		4,580		3,844	4,580		3,844
Fair value		$ 4,580		$ 3,844	$ 4,580		$ 3,844	$ 3,504		4,894
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[12],[17]	15.38%			15.38%
Spread		10.00%	[12],[17]	10.00%	10.00%	[12],[17]	10.00%	10.00%	[15],[16]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					4		4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					(3)	[15],[16]	(4)
Gross Additions					162		1
Gross Reductions					0		0
Ending balance		$ 159	[12],[17]	$ (3)	159	[12],[17]	(3)
Fair value		$ 159	[12],[17]	$ (3)	$ 159	[12],[17]	$ (3)	$ (3)	[15],[16]	(4)
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		15.38%	[12],[17]	12.63%	15.38%	[12],[17]	12.63%	14.13%	[15]
Spread		10.00%	[12],[17]	10.00%	10.00%	[12],[17]	10.00%	10.00%	[15]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					569		506
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					4,545	[15]	4,740
Gross Additions					61		65
Gross Reductions					469		210
Ending balance		$ 4,137	[12],[17]	$ 4,595	4,137	[12],[17]	4,595
Fair value		4,137	[12],[17]	4,595	4,137	[12],[17]	4,595	$ 4,545	[15]	4,740
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Warrants
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	[9]	0
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		0	[10]	0	0	[10]	0
Fair value		0	[10]	0	0	[10]	0	0	[9]	0
Investment, Identifier [Axis]: ArborWorks, LLC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13]				0
Ending balance	[11]	0			0
Fair value		$ 0	[11]		$ 0	[11]		$ 0	[13]
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		15.43%	[11],[12],[17],[21]		15.43%	[11],[12],[17],[21]		13.41%	[13],[15]
Spread		7.00%	[11],[12],[17],[21]		7.00%	[11],[12],[17],[21]		9.00%	[13],[15]
PIK Rate	[11],[12],[17],[21]	3.00%			3.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 3,945
Ending balance	[11],[12],[17],[21]	$ 3,899			3,899
Fair value		$ 3,899	[11],[12],[17],[21]		$ 3,899	[11],[12],[17],[21]		$ 3,945	[13],[15]
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		15.43%	[11],[12],[17],[21]		15.43%	[11],[12],[17],[21]		13.56%	[13],[15]
Spread		7.00%	[11],[12],[17],[21]		7.00%	[11],[12],[17],[21]		9.00%	[13],[15]
PIK Rate	[11],[12],[17],[21]	3.00%			3.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 25,065
Ending balance	[11],[12],[17],[21]	$ 16,611			16,611
Fair value		16,611	[11],[12],[17],[21]		16,611	[11],[12],[17],[21]		$ 25,065	[13],[15]
Investment, Identifier [Axis]: Archer Systems, LLC, Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13]				1,388
Ending balance	[11]	2,030			2,030
Fair value		$ 2,030	[11]		$ 2,030	[11]		$ 1,388	[13]
Investment, Identifier [Axis]: Archer Systems, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread		6.00%	[11],[12],[17],[18]		6.00%	[11],[12],[17],[18]		6.50%	[13],[14],[15],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15],[16]				$ (135)
Ending balance	[11],[12],[17],[18]	$ (114)			(114)
Fair value		$ (114)	[11],[12],[17],[18]		$ (114)	[11],[12],[17],[18]		$ (135)	[13],[14],[15],[16]
Investment, Identifier [Axis]: Archer Systems, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		11.54%	[11],[12],[17]		11.54%	[11],[12],[17]		10.92%	[13],[14],[15]
Spread		6.00%	[11],[12],[17]		6.00%	[11],[12],[17]		6.50%	[13],[14],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15]				$ 66,511
Ending balance	[11],[12],[17]	$ 45,375			45,375
Fair value		45,375	[11],[12],[17]		45,375	[11],[12],[17]		$ 66,511	[13],[14],[15]
Investment, Identifier [Axis]: Arrow International, Inc, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[13],[14],[15],[27]							10.36%
Spread	[13],[14],[15],[27]							6.60%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15],[27]				36,000
Fair value	[13],[14],[15],[27]							$ 36,000
Investment, Identifier [Axis]: BBB Tank Services, LLC, Member Units
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		0
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		0		0	0		0
Fair value		$ 0		$ 0	$ 0		$ 0	$ 0		0
Investment, Identifier [Axis]: BBB Tank Services, LLC, Preferred Stock (non-voting)
Schedule of Investments [Line Items]
Total Rate		15.00%		15.00%	15.00%		15.00%	15.00%
PIK Rate		15.00%		15.00%	15.00%		15.00%
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		0
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		$ 0		$ 0	0		0
Fair value		$ 0		$ 0	$ 0		$ 0	$ 0		0
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt 1
Schedule of Investments [Line Items]
Total Rate		16.44%	[12],[26]	13.56%	16.44%	[12],[26]	13.56%	15.12%	[15],[28]
Spread		11.00%	[12],[26]	11.00%	11.00%	[12],[26]	11.00%	11.00%	[15],[28]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					96		75
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					800	[15],[28]	800
Gross Additions					0		0
Gross Reductions					200		0
Ending balance		$ 600	[12],[26]	$ 800	600	[12],[26]	800
Fair value		$ 600	[12],[26]	$ 800	$ 600	[12],[26]	$ 800	$ 800	[15],[28]	800
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt 2
Schedule of Investments [Line Items]
Total Rate		16.44%	[12],[26]	13.56%	16.44%	[12],[26]	13.56%	15.12%	[15],[28]
Spread		11.00%	[12],[26]	11.00%	11.00%	[12],[26]	11.00%	11.00%	[15],[28]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					116		(209)
Amount of Interest, Fees or Dividends Credited to Income					484		377
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					2,086	[15],[28]	1,707
Gross Additions					116		0
Gross Reductions					0		209
Ending balance		$ 2,202	[12],[26]	$ 1,498	2,202	[12],[26]	1,498
Fair value		2,202	[12],[26]	1,498	2,202	[12],[26]	1,498	$ 2,086	[15],[28]	1,707
Investment, Identifier [Axis]: Barfly Ventures, LLC, Member Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					(280)		1,390
Amount of Interest, Fees or Dividends Credited to Income					0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					3,320	[13]	1,930
Gross Additions					0		1,390
Gross Reductions					280		0
Ending balance		3,040	[11]	3,320	3,040	[11]	3,320
Fair value		$ 3,040	[11]	$ 3,320	$ 3,040	[11]	$ 3,320	$ 3,320	[13]	1,930
Investment, Identifier [Axis]: Barfly Ventures, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		7.00%	[11]	7.00%	7.00%	[11]	7.00%	7.00%	[13]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					45		38
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					711	[13]	710
Gross Additions					0		1
Gross Reductions					0		0
Ending balance		$ 711	[11]	$ 711	711	[11]	711
Fair value		711	[11]	711	711	[11]	711	$ 711	[13]	710
Investment, Identifier [Axis]: Batjer TopCo, LLC, Preferred Stock
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					2,055		0
Amount of Interest, Fees or Dividends Credited to Income					630		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					4,095	[19]	0
Gross Additions					2,055		4,095
Gross Reductions					0		0
Ending balance		6,150	[20]	4,095	6,150	[20]	4,095
Fair value		6,150	[20]	4,095	6,150	[20]	4,095	4,095	[19]	0
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					6		0
Amount of Interest, Fees or Dividends Credited to Income					1		4
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					(8)	[16]	0
Gross Additions					8		451
Gross Reductions					0		459
Ending balance		0	[18]	(8)	0	[18]	(8)
Fair value		$ 0	[18]	$ (8)	$ 0	[18]	$ (8)	(8)	[16]	0
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		10.00%		11.00%	10.00%		11.00%
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					11		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					0	[16]	0
Gross Additions					630		0
Gross Reductions					0		0
Ending balance		$ 630		$ 0	630		0
Fair value		$ 630		$ 0	$ 630		$ 0	$ 0	[16]	0
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate		10.00%		11.00%	10.00%		11.00%	11.00%
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					73		0
Amount of Interest, Fees or Dividends Credited to Income					859		824
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					10,933		0
Gross Additions					93		10,927
Gross Reductions					451		0
Ending balance		$ 10,575		$ 10,927	10,575		10,927
Fair value		10,575		10,927	10,575		10,927	$ 10,933		0
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 1
Schedule of Investments [Line Items]
Total Rate	[13],[19],[29]							8.00%
PIK Rate	[13],[19],[29]							8.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[19],[29]				4,561
Ending balance	[11],[20],[30]	2,820			2,820
Fair value		2,820	[11],[20],[30]		2,820	[11],[20],[30]		$ 4,561	[13],[19],[29]
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 2
Schedule of Investments [Line Items]
PIK Rate	[13],[16],[19],[29]							16.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[16],[19],[29]				270
Ending balance	[11],[20],[30]	220			220
Fair value		$ 220	[11],[20],[30]		220	[11],[20],[30]		$ 270	[13],[16],[19],[29]
Investment, Identifier [Axis]: Berry Aviation, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate	[13]							12.00%
PIK Rate	[13]							1.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13]				$ 195
Fair value	[13]							$ 195
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Spread		7.25%	[11],[12],[17],[18]		7.25%	[11],[12],[17],[18]		1.00%	[13],[14],[15],[16]
PIK Rate	[13],[14],[15],[16]							6.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15],[16]				$ (76)
Ending balance	[11],[12],[17],[18]	$ (65)			(65)
Fair value		$ (65)	[11],[12],[17],[18]		$ (65)	[11],[12],[17],[18]		$ (76)	[13],[14],[15],[16]
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		12.67%	[11],[12],[17]		12.67%	[11],[12],[17]		11.40%	[13],[14],[15]
Spread		7.25%	[11],[12],[17]		7.25%	[11],[12],[17]		1.00%	[13],[14],[15]
PIK Rate		6.25%	[11],[12],[17]		6.25%	[11],[12],[17]		6.00%	[13],[14],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[14],[15]				$ 27,505
Ending balance	[11],[12],[17]	$ 27,737			27,737
Fair value		27,737	[11],[12],[17]		27,737	[11],[12],[17]		$ 27,505	[13],[14],[15]
Investment, Identifier [Axis]: Binswanger Enterprises, LLC, Member Units
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13]				420
Ending balance	[11]	20			20
Fair value		20	[11]		20	[11]		420	[13]
Investment, Identifier [Axis]: Bluestem Brands, Inc., Common Stock
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[7],[19]				4,860
Ending balance	[8]	1,140			1,140
Fair value		$ 1,140	[8]		$ 1,140	[8]		$ 4,860	[7],[19]
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[8],[12]	16.00%			16.00%
Spread		7.50%	[8],[12]		7.50%	[8],[12]		8.50%	[7],[15],[16]
PIK Rate	[8],[12]	15.00%			15.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[7],[15],[16]				$ 0
Ending balance	[8],[12]	$ 2,311			2,311
Fair value		$ 2,311	[8],[12]		$ 2,311	[8],[12]		$ 0	[7],[15],[16]
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		13.94%	[8],[12],[17]		13.94%	[8],[12],[17]		12.94%	[7],[15]
Spread		8.50%	[8],[12],[17]		8.50%	[8],[12],[17]		8.50%	[7],[15]
PIK Rate	[8],[12],[17]	12.94%			12.94%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[7],[15]				$ 3,139
Ending balance	[8],[12],[17]	$ 3,344			3,344
Fair value		3,344	[8],[12],[17]		3,344	[8],[12],[17]		$ 3,139	[7],[15]
Investment, Identifier [Axis]: Bluestem Brands, Inc., Warrants
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[7],[9]				1,095
Ending balance	[8],[10]	260			260
Fair value		260	[8],[10]		260	[8],[10]		1,095	[7],[9]
Investment, Identifier [Axis]: Boccella Precast Products LLC, Member Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					(840)		(1,510)
Amount of Interest, Fees or Dividends Credited to Income					61		73
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					2,970	[19]	4,830
Gross Additions					0		0
Gross Reductions					840		1,510
Ending balance		2,130		3,320	2,130		3,320
Fair value		$ 2,130		$ 3,320	$ 2,130		$ 3,320	$ 2,970	[19]	4,830
Investment, Identifier [Axis]: Boccella Precast Products LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		10.00%		10.00%	10.00%		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					24		24
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					320		320
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		$ 320		$ 320	320		320
Fair value		$ 320		$ 320	$ 320		$ 320	$ 320		320
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Class B Preferred Member Units
Schedule of Investments [Line Items]
Total Rate		8.00%	[20]	8.00%	8.00%	[20]	8.00%	8.00%	[19]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					(300)		3,840
Amount of Interest, Fees or Dividends Credited to Income					2,920		558
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					31,420	[19]	23,170
Gross Additions					0		3,840
Gross Reductions					300		0
Ending balance		$ 31,120	[20]	$ 27,010	31,120	[20]	27,010
Fair value		$ 31,120	[20]	$ 27,010	$ 31,120	[20]	$ 27,010	$ 31,420	[19]	23,170
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		14.52%	[12],[17],[31]		14.52%	[12],[17],[31]		13.39%	[14],[15],[32]
Spread		9.15%	[12],[17],[31]		9.15%	[12],[17],[31]		9.26%	[14],[15],[32]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[14],[15],[32]				$ 99,194
Ending balance	[12],[17],[31]	$ 97,216			97,216
Fair value		97,216	[12],[17],[31]		97,216	[12],[17],[31]		$ 99,194	[14],[15],[32]
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread				8.00%			8.00%
Amount of Realized Gain/(Loss)					0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					1		19
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					0		0
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		0		$ 0	0		0
Fair value		$ 0		$ 0	$ 0		$ 0	0		0
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		14.52%		12.63%	14.52%		12.63%
Spread		9.15%		10.00%	9.15%		10.00%
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					(106)		266
Amount of Interest, Fees or Dividends Credited to Income					10,599		5,780
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					99,194		39,000
Gross Additions					106		60,194
Gross Reductions					2,084		0
Ending balance		$ 97,216		$ 99,194	97,216		99,194
Fair value		97,216		99,194	97,216		99,194	$ 99,194		39,000
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[33],[34]	571			571
Fair value	[11],[33],[34]	$ 571			$ 571
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 1
Schedule of Investments [Line Items]
Spread	[11],[12],[17],[18],[33],[34]	7.00%			7.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17],[18],[33],[34]	$ (26)			$ (26)
Fair value	[11],[12],[17],[18],[33],[34]	$ (26)			$ (26)
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17],[33],[34]	11.40%			11.40%
Spread	[11],[12],[17],[33],[34]	6.00%			6.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17],[33],[34]	$ 6,357			$ 6,357
Fair value	[11],[12],[17],[33],[34]	$ 6,357			$ 6,357
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17],[33],[34]	13.40%			13.40%
Spread	[11],[12],[17],[33],[34]	8.00%			8.00%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17],[33],[34]	$ 6,356			$ 6,356
Fair value	[11],[12],[17],[33],[34]	$ 6,356			$ 6,356
Investment, Identifier [Axis]: Brainworks Software, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate		12.50%	[11],[12],[21],[26]		12.50%	[11],[12],[21],[26]		12.50%	[13],[15],[22],[28]
Spread		9.25%	[11],[12],[21],[26]		9.25%	[11],[12],[21],[26]		9.25%	[13],[15],[22],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15],[22],[28]				$ 761
Ending balance	[11],[12],[21],[26]	$ 761			761
Fair value		$ 761	[11],[12],[21],[26]		$ 761	[11],[12],[21],[26]		$ 761	[13],[15],[22],[28]
Investment, Identifier [Axis]: Brainworks Software, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		12.50%	[11],[12],[21],[26]		12.50%	[11],[12],[21],[26]		12.50%	[13],[15],[22],[28]
Spread		9.25%	[11],[12],[21],[26]		9.25%	[11],[12],[21],[26]		9.25%	[13],[15],[22],[28]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15],[22],[28]				$ 2,916
Ending balance	[11],[12],[21],[26]	$ 1,075			1,075
Fair value		1,075	[11],[12],[21],[26]		1,075	[11],[12],[21],[26]		$ 2,916	[13],[15],[22],[28]
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					(1,460)		(2,040)
Amount of Interest, Fees or Dividends Credited to Income					90		795
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					7,080	[19]	7,710
Gross Additions					0		0
Gross Reductions					1,460		2,040
Ending balance		5,620	[20]	5,670	5,620	[20]	5,670
Fair value		$ 5,620	[20]	$ 5,670	$ 5,620	[20]	$ 5,670	$ 7,080	[19]	7,710
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		15.44%	[12]	12.56%	15.44%	[12]	12.56%	14.12%	[15]
Spread		10.00%	[12]	10.00%	10.00%	[12]	10.00%	10.00%	[15]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					(117)		0
Amount of Interest, Fees or Dividends Credited to Income					682		649
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					5,964	[15]	8,037
Gross Additions					30		19
Gross Reductions					489		1,972
Ending balance		$ 5,505	[12]	$ 6,084	5,505	[12]	6,084
Fair value		5,505	[12]	6,084	5,505	[12]	6,084	$ 5,964	[15]	8,037
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Preferred Member Units
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					75		75
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					1,000	[19],[29]	1,000
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		1,000		1,000	1,000		1,000
Fair value		1,000		$ 1,000	1,000		$ 1,000	$ 1,000	[19],[29]	1,000
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Preferred Member Units 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[20],[30]	1,000			1,000
Fair value	[20],[30]	$ 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%	13.00%		13.00%	13.00%
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					869		869
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					8,813		8,813
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		$ 8,813		$ 8,813	8,813		8,813
Fair value		$ 8,813		$ 8,813	$ 8,813		$ 8,813	$ 8,813		8,813
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		13.00%	[30]	13.00%	13.00%	[30]	13.00%	13.00%	[29]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					99		99
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					1,000	[29]	1,000
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		$ 1,000	[30]	$ 1,000	1,000	[30]	1,000
Fair value		1,000	[30]	1,000	1,000	[30]	1,000	$ 1,000	[29]	1,000
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[9]				4,340
Ending balance	[10]	4,450			4,450
Fair value		4,450	[10]		4,450	[10]		4,340	[9]
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants 1
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					46		83
Amount of Interest, Fees or Dividends Credited to Income					0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					1,828		1,712
Gross Additions					46		83
Gross Reductions					0		0
Ending balance		1,874		1,795	1,874		1,795
Fair value		1,874		1,795	1,874		1,795	1,828		1,712
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants 2
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					64		117
Amount of Interest, Fees or Dividends Credited to Income					0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					2,512		2,348
Gross Additions					64		117
Gross Reductions					0		0
Ending balance		2,576		2,465	2,576		2,465
Fair value		2,576		$ 2,465	2,576		$ 2,465	2,512		2,348
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund III, LP)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[19],[35],[36],[37]				4,727
Ending balance	[33],[38],[39]	4,221			4,221
Fair value		4,221	[33],[38],[39]		4,221	[33],[38],[39]		4,727	[19],[35],[36],[37]
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund IV, LP)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[19],[35],[36],[37]				4,541
Ending balance	[20],[33],[38],[39]	4,661			4,661
Fair value		4,661	[20],[33],[38],[39]		4,661	[20],[33],[38],[39]		4,541	[19],[35],[36],[37]
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund V, LP)
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[35],[36],[37]				2,229
Ending balance	[20],[33],[38],[39]	2,391			2,391
Fair value		$ 2,391	[20],[33],[38],[39]		$ 2,391	[20],[33],[38],[39]		$ 2,229	[35],[36],[37]
Investment, Identifier [Axis]: Buca C, LLC, Preferred Member Units
Schedule of Investments [Line Items]
Total Rate		6.00%		6.00%	6.00%		6.00%	6.00%
PIK Rate		6.00%		6.00%	6.00%		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					0		0
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					0		0
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		$ 0		$ 0	0		0
Fair value		$ 0		$ 0	$ 0		$ 0	$ 0		0
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		12.00%	[26]	9.00%	12.00%	[26]	9.00%	9.00%
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					292		1,604
Amount of Interest, Fees or Dividends Credited to Income					1,659		1,488
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					12,337		14,370
Gross Additions					292		1,602
Gross Reductions					375		1,966
Ending balance		$ 12,254	[26]	$ 14,006	12,254	[26]	14,006
Fair value		$ 12,254	[26]	14,006	$ 12,254	[26]	14,006	$ 12,337		14,370
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17]	10.42%			10.42%
Spread		5.00%	[11],[12],[17]		5.00%	[11],[12],[17]		5.00%	[13],[15],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15],[16]				$ 0
Ending balance	[11],[12],[17]	$ 465			465
Fair value		$ 465	[11],[12],[17]		$ 465	[11],[12],[17]		$ 0	[13],[15],[16]
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		10.42%	[11],[12],[17]		10.42%	[11],[12],[17]		8.91%	[13],[15]
Spread		5.00%	[11],[12],[17]		5.00%	[11],[12],[17]		5.00%	[13],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 19,933
Ending balance	[11],[12],[17]	$ 19,732			19,732
Fair value		19,732	[11],[12],[17]		19,732	[11],[12],[17]		$ 19,933	[13],[15]
Investment, Identifier [Axis]: CAI Software LLC, Preferred Equity 1
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[19]				1,789
Ending balance		1,789			1,789
Fair value		1,789			1,789			1,789	[19]
Investment, Identifier [Axis]: CAI Software LLC, Preferred Equity 2
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					0
Ending balance		0			0
Fair value		0			0			0
Investment, Identifier [Axis]: CBT Nuggets, LLC, Member Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					1,838		(2,370)
Amount of Interest, Fees or Dividends Credited to Income					2,059		2,471
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					49,002	[19]	50,620
Gross Additions					1,838		0
Gross Reductions					0		2,370
Ending balance		50,840	[20]	48,250	50,840	[20]	48,250
Fair value		50,840	[20]	48,250	50,840	[20]	48,250	49,002	[19]	50,620
Investment, Identifier [Axis]: CMS Minerals Investments, Member Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					99		0
Amount of Unrealized Gain/(Loss)					(366)		331
Amount of Interest, Fees or Dividends Credited to Income					44		150
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					1,670	[19],[29]	1,974
Gross Additions					99		331
Gross Reductions					1,769		415
Ending balance		0		1,890	0		1,890
Fair value		$ 0		1,890	0		1,890	$ 1,670	[19],[29]	1,974
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate	[13],[15],[40]							11.99%
Spread	[13],[15],[40]							8.50%
PIK Rate	[13],[15],[40]							0.01%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15],[40]				$ 28,328
Fair value	[13],[15],[40]							$ 28,328
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17]	12.07%			12.07%
Spread	[11],[12],[17]	6.50%			6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17]	$ 5,003			$ 5,003
Fair value	[11],[12],[17]	$ 5,003			$ 5,003
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17]	12.07%			12.07%
Spread	[11],[12],[17]	6.50%			6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17]	$ 1,557			$ 1,557
Fair value	[11],[12],[17]	$ 1,557			$ 1,557
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 3
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17]	12.07%			12.07%
Spread	[11],[12],[17]	6.50%			6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17]	$ 2,048			$ 2,048
Fair value	[11],[12],[17]	$ 2,048			$ 2,048
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 4
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17]	12.07%			12.07%
Spread	[11],[12],[17]	6.50%			6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17]	$ 587			$ 587
Fair value	[11],[12],[17]	$ 587			$ 587
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 5
Schedule of Investments [Line Items]
Total Rate	[11],[12],[17]	12.07%			12.07%
Spread	[11],[12],[17]	6.50%			6.50%
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Ending balance	[11],[12],[17]	$ 61			$ 61
Fair value	[11],[12],[17]	61			61
Investment, Identifier [Axis]: Café Brazil, LLC, Member Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					(180)		(200)
Amount of Interest, Fees or Dividends Credited to Income					149		178
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					2,210	[19]	2,570
Gross Additions					0		0
Gross Reductions					180		200
Ending balance		2,030	[20]	2,370	2,030	[20]	2,370
Fair value		2,030	[20]	2,370	2,030	[20]	2,370	2,210	[19]	2,570
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units 1
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					(4,550)		7,750
Amount of Interest, Fees or Dividends Credited to Income					188		188
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					25,495	[19]	13,275
Gross Additions					0		7,750
Gross Reductions					4,550		0
Ending balance		20,945	[20]	21,025	20,945	[20]	21,025
Fair value		$ 20,945	[20]	$ 21,025	$ 20,945	[20]	$ 21,025	$ 25,495	[19]	$ 13,275
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units 2
Schedule of Investments [Line Items]
Total Rate		15.00%	[20]	15.00%	15.00%	[20]	15.00%	15.00%	[19]
PIK Rate		15.00%	[20]		15.00%	[20]		15.00%	[19]	15.00%
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					454		792
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					3,994	[19]	9,510
Gross Additions					454		792
Gross Reductions					0		6,449
Ending balance		$ 4,448	[20]	$ 3,853	4,448	[20]	3,853
Fair value		$ 4,448	[20]	$ 3,853	$ 4,448	[20]	$ 3,853	$ 3,994	[19]	$ 9,510
Investment, Identifier [Axis]: California Splendor Holdings LLC, Secured Debt
Schedule of Investments [Line Items]
Total Rate		15.50%	[12],[17]	12.38%	15.50%	[12],[17]	12.38%	13.75%	[15]
Spread		10.00%	[12],[17]	10.00%	10.00%	[12],[17]	10.00%	10.00%	[15]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					(49)		52
Amount of Interest, Fees or Dividends Credited to Income					3,240		2,467
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					28,000	[15]	27,915
Gross Additions					10		85
Gross Reductions					49		0
Ending balance		$ 27,961	[12],[17]	$ 28,000	27,961	[12],[17]	28,000
Fair value		$ 27,961	[12],[17]	28,000	$ 27,961	[12],[17]	28,000	$ 28,000	[15]	27,915
Investment, Identifier [Axis]: Camin Cargo Control, Inc., Secured Debt
Schedule of Investments [Line Items]
Total Rate		11.93%	[8],[12],[17]		11.93%	[8],[12],[17]		10.88%	[7],[15]
Spread		6.50%	[8],[12],[17]		6.50%	[8],[12],[17]		6.50%	[7],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[7],[15]				$ 14,685
Ending balance	[8],[12],[17]	$ 14,569			14,569
Fair value		14,569	[8],[12],[17]		14,569	[8],[12],[17]		$ 14,685	[7],[15]
Investment, Identifier [Axis]: Career Team Holdings, LLC, Common Stock
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					4,500		4,500
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		4,500		4,500	4,500		4,500
Fair value		$ 4,500		$ 4,500	$ 4,500		$ 4,500	$ 4,500		4,500
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate				8.63%			8.63%
Spread		6.00%	[12],[17],[18]	6.00%	6.00%	[12],[17],[18]	6.00%	6.00%	[15],[16]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					18		5
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					(9)	[15],[16]	0
Gross Additions					439		0
Gross Reductions					451		0
Ending balance		$ (21)	[12],[17],[18]	$ 0	(21)	[12],[17],[18]	0
Fair value		$ (21)	[12],[17],[18]	$ 0	$ (21)	[12],[17],[18]	$ 0	$ (9)	[15],[16]	0
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		12.50%		12.50%	12.50%		12.50%	12.50%
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					1,950		1,950
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					20,090		20,050
Gross Additions					31		30
Gross Reductions					90		0
Ending balance		$ 20,031		$ 20,080	20,031		20,080
Fair value		20,031		20,080	20,031		20,080	$ 20,090		20,050
Investment, Identifier [Axis]: CaseWorthy, Inc., Common Equity
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13]				246
Ending balance	[11]	246			246
Fair value		$ 246	[11]		$ 246	[11]		$ 246	[13]
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 1
Schedule of Investments [Line Items]
Spread		6.00%	[11],[12],[17],[18]		6.00%	[11],[12],[17],[18]		6.00%	[13],[15],[16]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15],[16]				$ (11)
Ending balance	[11],[12],[17],[18]	$ (9)			(9)
Fair value		$ (9)	[11],[12],[17],[18]		$ (9)	[11],[12],[17],[18]		$ (11)	[13],[15],[16]
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		11.65%	[11],[12],[17]		11.65%	[11],[12],[17]		10.73%	[13],[15]
Spread		6.00%	[11],[12],[17]		6.00%	[11],[12],[17]		6.00%	[13],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 7,914
Ending balance	[11],[12],[17]	$ 7,973			7,973
Fair value		$ 7,973	[11],[12],[17]		$ 7,973	[11],[12],[17]		$ 7,914	[13],[15]
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 3
Schedule of Investments [Line Items]
Total Rate		11.65%	[11],[12],[17]		11.65%	[11],[12],[17]		10.48%	[13],[15]
Spread		6.00%	[11],[12],[17]		6.00%	[11],[12],[17]		5.75%	[13],[15]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	[13],[15]				$ 6,133
Ending balance	[11],[12],[17]	$ 6,133			6,133
Fair value		6,133	[11],[12],[17]		6,133	[11],[12],[17]		$ 6,133	[13],[15]
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Preferred Member Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					1,700		2,038
Amount of Interest, Fees or Dividends Credited to Income					90		90
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					8,700		5,840
Gross Additions					1,700		2,320
Gross Reductions					0		0
Ending balance		10,400		8,160	10,400		8,160
Fair value		$ 10,400		$ 8,160	$ 10,400		$ 8,160	$ 8,700		5,840
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 1
Schedule of Investments [Line Items]
Spread		9.00%	[12],[17],[18]	9.00%	9.00%	[12],[17],[18]	9.00%	9.00%	[15],[16]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					0		0
Amount of Interest, Fees or Dividends Credited to Income					9		25
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					0	[15],[16]	0
Gross Additions					0		1,440
Gross Reductions					0		1,440
Ending balance		$ 0	[12],[17],[18]	$ 0	0	[12],[17],[18]	0
Fair value		$ 0	[12],[17],[18]	$ 0	$ 0	[12],[17],[18]	$ 0	$ 0	[15],[16]	0
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		14.48%	[12],[17]	11.63%	14.48%	[12],[17]	11.63%	13.13%	[15]
Spread		9.00%	[12],[17]	9.00%	9.00%	[12],[17]	9.00%	9.00%	[15]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					70		507
Amount of Interest, Fees or Dividends Credited to Income					1,657		1,271
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					14,954	[15]	8,864
Gross Additions					2,620		6,470
Gross Reductions					0		387
Ending balance		$ 17,574	[12],[17]	$ 14,947	17,574	[12],[17]	14,947
Fair value		17,574	[12],[17]	14,947	17,574	[12],[17]	14,947	$ 14,954	[15]	8,864
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 1
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					3,010		(1,810)
Amount of Interest, Fees or Dividends Credited to Income					2,792		1,335
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					22,920	[19]	24,140
Gross Additions					3,010		0
Gross Reductions					0		1,810
Ending balance		25,930	[20]	22,330	25,930	[20]	22,330
Fair value		25,930	[20]	22,330	25,930	[20]	22,330	22,920	[19]	24,140
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 2
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					0		0
Amount of Unrealized Gain/(Loss)					260		0
Amount of Interest, Fees or Dividends Credited to Income					69		55
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					2,710	[19],[29]	1,540
Gross Additions					260		451
Gross Reductions					0		0
Ending balance		2,970	[20],[30]	1,991	2,970	[20],[30]	1,991
Fair value		$ 2,970	[20],[30]	$ 1,991	$ 2,970	[20],[30]	$ 1,991	$ 2,710	[19],[29]	1,540
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 1
Schedule of Investments [Line Items]
Total Rate				8.63%			8.63%
Spread		6.00%	[12],[17],[18]	6.00%	6.00%	[12],[17],[18]	6.00%	6.00%	[15],[16]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					140		0
Amount of Interest, Fees or Dividends Credited to Income					21		6
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					0	[15],[16]	0
Gross Additions					0		0
Gross Reductions					0		0
Ending balance		$ 0	[12],[17],[18]	$ 0	0	[12],[17],[18]	0
Fair value		$ 0	[12],[17],[18]	$ 0	$ 0	[12],[17],[18]	$ 0	$ 0	[15],[16]	0
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 2
Schedule of Investments [Line Items]
Total Rate		13.49%	[12],[17]	10.63%	13.49%	[12],[17]	10.63%	12.13%	[15]
Spread		8.00%	[12],[17]	8.00%	8.00%	[12],[17]	8.00%	8.00%	[15]
Amount of Realized Gain/(Loss)					$ 0		$ 0
Amount of Unrealized Gain/(Loss)					(7)		(51)
Amount of Interest, Fees or Dividends Credited to Income					1,655		1,314
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance					16,945	[15]	17,817
Gross Additions					7		51
Gross Reductions					545		402
Ending balance		$ 16,407	[12],[17]	$ 17,466	16,407	[12],[17]	17,466
Fair value		16,407	[12],[17]	17,466	16,407	[12],[17]	17,466	$ 16,945	[15]	17,817
Investment, Identifier [Axis]: Chandler Signs Holdings, LLC, Class A Units
Schedule of Investments [Line Items]
Amount of Realized Gain/(Loss)					1,797		0
Amount of Unrealized Gain/(Loss)					(290)		510
Amount of Interest, Fees or Dividends Credited to Income<