Quarterly report pursuant to Section 13 or 15(d)

Consolidated Schedule of Investments

v3.23.2
Consolidated Schedule of Investments - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]        
Cost $ 3,742,689 $ 3,773,752 [1] $ 3,742,689 [2]  
Fair value $ 4,210,543 $ 4,102,177 [3] 4,210,543 [4]  
Investment owned, percent of net assets 186.70% 194.50%    
Analytical Systems Keco Holdings, LLC        
Schedule of Investments [Line Items]        
Cost $ 10,385 $ 10,485    
Fair value 8,512 8,046    
ASC Interests, LLC        
Schedule of Investments [Line Items]        
Cost 3,643 3,549    
Fair value 2,507 2,849    
ATS Workholding, LLC        
Schedule of Investments [Line Items]        
Cost 8,608 [5] 8,484 [6]    
Fair value 1,202 [5] 1,639 [6]    
Barfly Ventures, LLC        
Schedule of Investments [Line Items]        
Cost 2,295 [5] 2,295 [6]    
Fair value 3,751 [5] 4,031 [6]    
Batjer TopCo, LLC        
Schedule of Investments [Line Items]        
Cost 14,585 15,020    
Fair value 16,725 15,020    
Bolder Panther Group, LLC        
Schedule of Investments [Line Items]        
Cost 111,328 112,576    
Fair value 128,995 130,614    
Brewer Crane Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 9,996 10,244    
Fair value 12,013 13,044    
Bridge Capital Solutions Corporation        
Schedule of Investments [Line Items]        
Cost 12,945 12,945    
Fair value 15,263 15,153    
California Splendor Holdings LLC        
Schedule of Investments [Line Items]        
Cost 43,028 42,720    
Fair value 55,730 57,489    
Centre Technologies Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 21,088 21,076    
Fair value 25,430 23,654    
Chamberlin Holding LLC        
Schedule of Investments [Line Items]        
Cost 29,538 30,148    
Fair value 43,177 42,575    
Charps, LLC        
Schedule of Investments [Line Items]        
Cost 6,624 6,606    
Fair value 19,494 19,034    
Clad-Rex Steel, LLC        
Schedule of Investments [Line Items]        
Cost 18,509 18,969    
Fair value 18,165 20,309    
Cody Pools, Inc.        
Schedule of Investments [Line Items]        
Cost 54,578 50,281    
Fair value 111,432 100,443    
Colonial Electric Company LLC        
Schedule of Investments [Line Items]        
Cost 31,189 30,831    
Fair value 32,129 32,311    
CompareNetworks Topco, LLC        
Schedule of Investments [Line Items]        
Cost 6,839 7,207    
Fair value 21,249 25,071    
Cybermedia Technologies, LLC        
Schedule of Investments [Line Items]        
Cost 43,720      
Fair value 43,720      
Datacom, LLC        
Schedule of Investments [Line Items]        
Cost 11,458 11,023    
Fair value 10,798 10,682    
Digital Products Holdings LLC        
Schedule of Investments [Line Items]        
Cost 24,234 25,024    
Fair value 24,568 25,358    
Direct Marketing Solutions, Inc.        
Schedule of Investments [Line Items]        
Cost 34,681 35,434    
Fair value 49,815 49,487    
Elgin AcquireCo, LLC        
Schedule of Investments [Line Items]        
Cost 32,163 34,040    
Fair value 32,639 34,040    
Gamber-Johnson Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 77,041 81,377    
Fair value 129,838 114,968    
Garreco, LLC        
Schedule of Investments [Line Items]        
Cost 4,472 5,026    
Fair value 4,852 5,626    
GRT Rubber Technologies LLC        
Schedule of Investments [Line Items]        
Cost 54,701 54,048    
Fair value 86,233 85,603    
Gulf Publishing Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 11,681 11,681    
Fair value 6,064 6,064    
Harris Preston Fund Investments        
Schedule of Investments [Line Items]        
Cost 3,612 [7],[8] 4,143 [9],[10]    
Fair value 6,661 [7],[8] 7,800 [9],[10]    
IG Investor, LLC        
Schedule of Investments [Line Items]        
Cost 52,390      
Fair value 52,390      
Jensen Jewelers of Idaho, LLC        
Schedule of Investments [Line Items]        
Cost 3,259 17,420    
Fair value 15,960 3,255    
Johnson Downie Opco, LLC        
Schedule of Investments [Line Items]        
Cost 12,909 13,056    
Fair value 16,388 15,539    
JorVet Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 36,199 36,173    
Fair value 36,199 36,173    
KBK Industries, LLC        
Schedule of Investments [Line Items]        
Cost 6,034      
Fair value 17,660      
Kickhaefer Manufacturing Company, LLC        
Schedule of Investments [Line Items]        
Cost 37,625 37,448    
Fair value 34,903 34,286    
MetalForming AcquireCo, LLC        
Schedule of Investments [Line Items]        
Cost 31,263 31,123    
Fair value 31,244 31,123    
MH Corbin Holding LLC        
Schedule of Investments [Line Items]        
Cost 16,360 16,556    
Fair value 5,503 4,548    
MS Private Loan Fund I, LP        
Schedule of Investments [Line Items]        
Cost 14,250 [7],[8] 14,250 [9],[10]    
Fair value 14,635 [7],[8] 14,833 [9],[10]    
Mystic Logistics Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 8,466 8,466    
Fair value 32,896 28,576    
Nebraska Vet AcquireCo, LLC        
Schedule of Investments [Line Items]        
Cost 38,598 37,393    
Fair value 44,584 38,294    
NexRev LLC        
Schedule of Investments [Line Items]        
Cost 17,938 19,548    
Fair value 11,818 9,587    
NRP Jones, LLC        
Schedule of Investments [Line Items]        
Cost 5,797 5,797    
Fair value 6,090 6,870    
NuStep, LLC        
Schedule of Investments [Line Items]        
Cost 35,081 35,075    
Fair value 36,349 36,003    
OMi Topco, LLC        
Schedule of Investments [Line Items]        
Cost 15,239 16,714    
Fair value 43,560 38,560    
Orttech Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 32,658 33,429    
Fair value 39,360 35,179    
Pearl Meyer Topco LLC        
Schedule of Investments [Line Items]        
Cost 57,527 41,537    
Fair value 88,771 71,941    
PPL RVs, Inc.        
Schedule of Investments [Line Items]        
Cost 22,463 23,787    
Fair value 38,610 40,843    
Principle Environmental, LLC        
Schedule of Investments [Line Items]        
Cost 12,726 12,715    
Fair value 16,797 18,816    
Robbins Bros. Jewelry, Inc.        
Schedule of Investments [Line Items]        
Cost 45,808 46,439    
Fair value 40,434 50,249    
Tedder Industries, LLC        
Schedule of Investments [Line Items]        
Cost 26,638 26,277    
Fair value 23,790 24,641    
Televerde, LLC        
Schedule of Investments [Line Items]        
Cost 2,008 2,008    
Fair value 7,876 7,202    
Trantech Radiator Topco, LLC        
Schedule of Investments [Line Items]        
Cost 12,555 12,544    
Fair value 19,690 15,720    
Volusion, LLC        
Schedule of Investments [Line Items]        
Cost 30,122 33,719    
Fair value 12,840 14,914    
VVS Holdco LLC        
Schedule of Investments [Line Items]        
Cost 40,788 41,977    
Fair value 40,788 42,080    
Ziegler’s NYPD, LLC        
Schedule of Investments [Line Items]        
Cost 7,634 7,634    
Fair value 3,926 4,311    
AAC Holdings, Inc.        
Schedule of Investments [Line Items]        
Cost 16,263 14,738 [11]    
Fair value 12,501 11,550 [11]    
BBB Tank Services, LLC        
Schedule of Investments [Line Items]        
Cost 5,762 5,762    
Fair value 3,002 2,886    
Boccella Precast Products LLC        
Schedule of Investments [Line Items]        
Cost 2,576 2,576    
Fair value 2,670 3,290    
Buca C, LLC        
Schedule of Investments [Line Items]        
Cost 21,750 22,125    
Fair value 11,964 12,337    
Career Team Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 25,052 24,581    
Fair value 25,052 24,581    
Classic H&G Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 29,523 29,502    
Fair value 42,064 48,471    
DMA Industries, LLC        
Schedule of Investments [Line Items]        
Cost 25,800 26,979    
Fair value 27,260 28,460    
Dos Rios Partners        
Schedule of Investments [Line Items]        
Cost 8,318 [7],[8] 8,510 [9],[10]    
Fair value 11,990 [7],[8] 12,025 [9],[10]    
Freeport Financial Funds        
Schedule of Investments [Line Items]        
Cost 9,274 [7],[8] 9,810 [9],[10]    
Fair value 8,940 [7],[8] 9,331 [9],[10]    
GFG Group, LLC        
Schedule of Investments [Line Items]        
Cost 16,181 16,169    
Fair value 19,655 18,485    
Harris Preston Fund Investments        
Schedule of Investments [Line Items]        
Cost 6,996 [7],[8] 6,290 [9],[10]    
Fair value 9,052 [7],[8] 8,063 [9],[10]    
Hawk Ridge Systems, LLC        
Schedule of Investments [Line Items]        
Cost 48,487 43,868    
Fair value 63,988 59,365    
Houston Plating and Coatings, LLC        
Schedule of Investments [Line Items]        
Cost 5,352 5,352    
Fair value 6,390 5,400    
Infinity X1 Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 21,832      
Fair value 21,832      
Integral Energy Services        
Schedule of Investments [Line Items]        
Cost [5] 16,916      
Fair value [5] 16,395      
Iron-Main Investments, LLC        
Schedule of Investments [Line Items]        
Cost 49,610 37,931    
Fair value 49,610 37,931    
ITA Holdings Group, LLC        
Schedule of Investments [Line Items]        
Cost 8,573      
Fair value 8,573      
OnAsset Intelligence, Inc.        
Schedule of Investments [Line Items]        
Cost 12,683 12,683    
Fair value 4,187 5,309    
Oneliance, LLC        
Schedule of Investments [Line Items]        
Cost 6,613 6,615    
Fair value $ 6,552 6,615    
SI East, LLC        
Schedule of Investments [Line Items]        
Total Rate 11.25%      
Cost $ 55,793 90,926    
Fair value 70,316 103,436    
Slick Innovations, LLC        
Schedule of Investments [Line Items]        
Cost 13,376 14,154    
Fair value 14,890 15,370    
Student Resource Center, LLC        
Schedule of Investments [Line Items]        
Cost 4,770 [5] 4,556 [6]    
Fair value 4,770 [5] 4,556 [6]    
Superior Rigging & Erecting Co.        
Schedule of Investments [Line Items]        
Cost 24,905 25,878    
Fair value 26,045 25,878    
The Affiliati Network, LLC        
Schedule of Investments [Line Items]        
Cost 15,245 15,948    
Fair value 15,116 15,948    
UniTek Global Services, Inc.        
Schedule of Investments [Line Items]        
Cost 18,731 [12] 20,535 [11]    
Fair value 12,651 [12] 11,510 [11]    
Universal Wellhead Services Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 5,034 [5] 5,032 [6]    
Fair value 220 [5] 220 [6]    
World Micro Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 17,999 17,985    
Fair value 17,999 17,985    
AB Centers Acquisition Corporation        
Schedule of Investments [Line Items]        
Cost 20,585 [5] 17,216 [6]    
Fair value 21,228 [5] 17,754 [6]    
Acousti Engineering Company of Florida        
Schedule of Investments [Line Items]        
Cost 12,020 [5] 12,294 [6]    
Fair value 12,083 [5] 12,376 [6]    
Acumera, Inc.        
Schedule of Investments [Line Items]        
Cost 43,132 [5] 18,561 [6]    
Fair value 43,132 [5] 18,986 [6]    
Adams Publishing Group, LLC        
Schedule of Investments [Line Items]        
Cost 29,431 [5] 28,762 [6]    
Fair value 29,359 [5] 28,815 [6]    
AMEREQUIP LLC.        
Schedule of Investments [Line Items]        
Cost 38,387 [5] 38,461 [6]    
Fair value 39,072 [5] 39,105 [6]    
American Health Staffing Group, Inc.        
Schedule of Investments [Line Items]        
Cost 6,529 [5] 6,555 [6]    
Fair value 6,574 [5] 6,607 [6]    
American Nuts, LLC        
Schedule of Investments [Line Items]        
Cost 29,250 [5] 30,816 [6]    
Fair value 22,834 [5] 29,260 [6]    
American Teleconferencing Services, Ltd.        
Schedule of Investments [Line Items]        
Cost 16,686 [12] 16,686 [11]    
Fair value 782 [12] 976 [11]    
ArborWorks, LLC        
Schedule of Investments [Line Items]        
Cost 34,429 [5] 34,064 [6]    
Fair value 26,761 [5] 29,010 [6]    
Archer Systems, LLC        
Schedule of Investments [Line Items]        
Cost 53,571 [5] 67,583 [6]    
Fair value 54,665 [5] 67,764 [6]    
ATS Operating, LLC        
Schedule of Investments [Line Items]        
Cost 14,760 [5] 14,040 [6]    
Fair value 14,700 [5] 13,835 [6]    
AVEX Aviation Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 21,159 [5] 28,230 [6]    
Fair value 21,150 [5] 28,276 [6]    
Berry Aviation, Inc.        
Schedule of Investments [Line Items]        
Cost 0 [5] 1,356 [6]    
Fair value 4,250 [5] 5,026 [6]    
Bettercloud, Inc.        
Schedule of Investments [Line Items]        
Cost 27,835 [5] 26,944 [6]    
Fair value 28,276 [5] 27,429 [6]    
Bluestem Brands, Inc.        
Schedule of Investments [Line Items]        
Cost 5,090 [12] 3,317 [11]    
Fair value 7,318 [12] 9,094 [11]    
Bond Brand Loyalty ULC        
Schedule of Investments [Line Items]        
Cost [5],[8],[13] 13,137      
Fair value [5],[8],[13] 13,137      
Brainworks Software, LLC        
Schedule of Investments [Line Items]        
Cost 7,817 [5],[14],[15],[16] 7,817 [6]    
Fair value 2,143 [5],[14],[15],[16] 3,677 [6]    
Brightwood Capital Fund Investments        
Schedule of Investments [Line Items]        
Cost 13,412 [7],[8] 13,412 [9],[10]    
Fair value 11,506 [7],[8] 11,497 [9],[10]    
Burning Glass Intermediate Holding Company, Inc.        
Schedule of Investments [Line Items]        
Cost 20,281 [5] 19,628 [6]    
Fair value 20,556 [5] 19,933 [6]    
Cadence Aerospace LLC        
Schedule of Investments [Line Items]        
Cost [5] 9,261      
Fair value [5] 9,271      
CAI Software LLC        
Schedule of Investments [Line Items]        
Cost 1,789 1,789    
Fair value 1,789 1,789    
CaseWorthy, Inc.        
Schedule of Investments [Line Items]        
Cost 14,226 [5] 14,228 [6]    
Fair value 14,343 [5] 14,282 [6]    
Channel Partners Intermediateco, LLC        
Schedule of Investments [Line Items]        
Cost 46,813 [5] 40,163 [6]    
Fair value 46,834 [5] 40,325 [6]    
Computer Data Source, LLC        
Schedule of Investments [Line Items]        
Cost 23,155 [5] 23,243 [6]    
Fair value 21,959 [5] 21,799 [6]    
Dalton US Inc.        
Schedule of Investments [Line Items]        
Cost 17,587 [5] 15,123 [6]    
Fair value 18,019 [5] 15,390 [6]    
DTE Enterprises, LLC        
Schedule of Investments [Line Items]        
Cost 1,996 [5] 8,001 [6]    
Fair value 1,480 [5] 7,474 [6]    
Dynamic Communities, LLC        
Schedule of Investments [Line Items]        
Cost 3,666 [5] 3,487 [6]    
Fair value 3,666 [5] 3,487 [6]    
Eastern Wholesale Fence LLC        
Schedule of Investments [Line Items]        
Cost 30,390 [5] 31,406 [6]    
Fair value 29,558 [5] 31,159 [6]    
EnCap Energy Fund Investments        
Schedule of Investments [Line Items]        
Cost 26,626 [7],[8] 28,866 [9],[10]    
Fair value 18,084 [7],[8] 21,905 [9],[10]    
GS HVAM Intermediate, LLC        
Schedule of Investments [Line Items]        
Cost 16,568 [5] 16,132 [6]    
Fair value 16,871 [5] 16,469 [6]    
Escalent, Inc.        
Schedule of Investments [Line Items]        
Cost [5] 26,170      
Fair value [5] 26,170      
Event Holdco, LLC        
Schedule of Investments [Line Items]        
Cost 47,666 [5] 47,618 [6]    
Fair value 46,363 [5] 45,590 [6]    
Flip Electronics LLC        
Schedule of Investments [Line Items]        
Cost 11,874 [5] 11,588 [6]    
Fair value 12,077 [5] 11,831 [6]    
Fuse, LLC        
Schedule of Investments [Line Items]        
Cost 2,066 [12] 2,066 [11]    
Fair value 1,374 [12] 1,512 [11]    
GS HVAM Intermediate, LLC        
Schedule of Investments [Line Items]        
Cost 10,631 [5] 12,864 [6]    
Fair value 10,659 [5] 12,876 [6]    
GULF PACIFIC ACQUISITION, LLC        
Schedule of Investments [Line Items]        
Cost 4,151 [5] 3,809 [6]    
Fair value 4,248 [5] 3,898 [6]    
HDC/HW Intermediate Holdings        
Schedule of Investments [Line Items]        
Cost 3,823 [5] 3,581 [6]    
Fair value 3,503 [5] 3,497 [6]    
HEADLANDS OP-CO LLC        
Schedule of Investments [Line Items]        
Cost 16,323 [5] 16,359 [6]    
Fair value 16,596 [5] 16,667 [6]    
IG Parent Corporation        
Schedule of Investments [Line Items]        
Cost 14,225 [12],[14],[17] 14,974 [11]    
Fair value 14,426 [12],[14],[17] 15,197 [11]    
Imaging Business Machines, L.L.C.        
Schedule of Investments [Line Items]        
Cost [5] 21,333      
Fair value [5] 21,333      
Industrial Services Acquisition, LLC        
Schedule of Investments [Line Items]        
Cost 21,006 [5] 20,507 [6]    
Fair value 20,993 [5] 20,540 [6]    
Infolinks Media Buyco, LLC        
Schedule of Investments [Line Items]        
Cost 9,916 [5] 8,442 [6]    
Fair value 10,031 [5] 8,574 [6]    
Inspire Aesthetics Management, LLC        
Schedule of Investments [Line Items]        
Cost [5] 10,623      
Fair value [5] 10,623      
Interface Security Systems, L.L.C        
Schedule of Investments [Line Items]        
Cost 9,072 [5] 8,919 [6]    
Fair value 2,604 [5] 2,764 [6]    
Invincible Boat Company, LLC.        
Schedule of Investments [Line Items]        
Cost 17,422 [5] 17,402 [6]    
Fair value 17,034 [5] 17,511 [6]    
Isagenix International, LLC        
Schedule of Investments [Line Items]        
Cost [12] 2,050      
Fair value [12] 2,074      
Jackmont Hospitality, Inc.        
Schedule of Investments [Line Items]        
Cost 2,776 [5] 2,685 [6]    
Fair value 3,178 [5] 3,202 [6]    
Joerns Healthcare, LLC        
Schedule of Investments [Line Items]        
Cost 10,857 [12] 10,723 [11]    
Fair value 2,431 [12] 2,801 [11]    
JTI Electrical & Mechanical, LLC        
Schedule of Investments [Line Items]        
Cost 37,527 [5] 37,907 [6]    
Fair value 39,016 [5] 39,652 [6]    
KMS, LLC        
Schedule of Investments [Line Items]        
Cost 8,371 [5] 8,410 [6]    
Fair value 7,789 [5] 8,017 [6]    
LL Management, Inc.        
Schedule of Investments [Line Items]        
Cost 27,885 [5] 27,980 [6]    
Fair value 27,936 [5] 27,926 [6]    
Mako Steel, LP        
Schedule of Investments [Line Items]        
Cost 17,319 [5] 18,185 [6]    
Fair value 17,520 [5] 18,307 [6]    
MB2 Dental Solutions, LLC        
Schedule of Investments [Line Items]        
Cost 17,921 [12] 16,051 [11]    
Fair value 18,080 [12] 16,214 [11]    
Microbe Formulas, LLC        
Schedule of Investments [Line Items]        
Cost 23,684 [5] 25,556 [6]    
Fair value 23,888 [5] 25,118 [6]    
MonitorUS Holding, LLC        
Schedule of Investments [Line Items]        
Cost 31,264 [5],[8],[13] 27,494 [6],[10],[18]    
Fair value 32,474 [5],[8],[13] 28,577 [6],[10],[18]    
NinjaTrader, LLC        
Schedule of Investments [Line Items]        
Cost 20,261 [5] 21,379    
Fair value 20,438 [5] 21,628    
NWN Corporation        
Schedule of Investments [Line Items]        
Cost 48,462 [5] 49,085 [6]    
Fair value 47,668 [5] 47,530 [6]    
Paragon Healthcare, Inc.        
Schedule of Investments [Line Items]        
Cost 21,571 [5] 20,898 [6]    
Fair value 22,129 [5] 21,118 [6]    
Power System Solutions        
Schedule of Investments [Line Items]        
Cost [5] 19,017      
Fair value [5] 19,017      
Project Eagle Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 28,885 [5] 29,022 [6]    
Fair value 29,255 [5] 29,401 [6]    
PTL US Bidco, Inc        
Schedule of Investments [Line Items]        
Cost 29,326 [5],[8] 27,575 [6],[10]    
Fair value 29,066 [5],[8] 27,737 [6],[10]    
RA Outdoors LLC        
Schedule of Investments [Line Items]        
Cost 13,252 [5] 13,230    
Fair value 12,134 [5] 12,083    
RM Bidder, LLC        
Schedule of Investments [Line Items]        
Cost 471 [5] 471 [6]    
Fair value 17 [5] 19 [6]    
Roof Opco, LLC        
Schedule of Investments [Line Items]        
Cost 6,629 [5] 5,716 [6]    
Fair value 6,751 [5] 5,817 [6]    
RTIC Subsidiary Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 16,821 [5] 17,849 [6]    
Fair value 15,630 [5] 16,625 [6]    
Rug Doctor, LLC.        
Schedule of Investments [Line Items]        
Cost 13,994 [5] 13,813 [6]    
Fair value 13,265 [5] 12,515 [6]    
SIB Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 9,819 [5] 9,761 [6]    
Fair value 8,917 [5] 9,123 [6]    
South Coast Terminals Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 35,410 [5] 41,396 [6]    
Fair value 36,240 [5] 42,500 [6]    
SPAU Holdings, LLC        
Schedule of Investments [Line Items]        
Cost 17,100 [5] 16,223 [6]    
Fair value 17,316 [5] 16,510 [6]    
U.S. TelePacific Corp.        
Schedule of Investments [Line Items]        
Cost [12] 3,923      
Fair value [12] 3,924      
Veregy Consolidated, Inc.        
Schedule of Investments [Line Items]        
Cost 16,723 [12] 16,751 [11]    
Fair value 14,802 [12] 14,849 [11]    
Wall Street Prep, Inc.        
Schedule of Investments [Line Items]        
Cost 4,099 [5] 4,567 [6]    
Fair value 4,162 [5] 4,560 [6]    
Watterson Brands, LLC        
Schedule of Investments [Line Items]        
Cost 30,306 [5] 29,286 [6]    
Fair value 30,682 [5] 29,708 [6]    
West Star Aviation Acquisition, LLC        
Schedule of Investments [Line Items]        
Cost 12,069 [5] 12,129 [6]    
Fair value 13,084 [5] 12,615 [6]    
Winter Services LLC        
Schedule of Investments [Line Items]        
Cost 11,173 [5] 9,797 [6]    
Fair value 11,330 [5] 9,975 [6]    
Xenon Arc, Inc.        
Schedule of Investments [Line Items]        
Cost 64,315 [5] 61,337 [6]    
Fair value 65,452 [5] 61,968 [6]    
Zips Car Wash, LLC        
Schedule of Investments [Line Items]        
Cost 21,642 [5] 21,639 [6]    
Fair value 21,586 [5] 21,891 [6]    
Market Force Information, LLC        
Schedule of Investments [Line Items]        
Cost   48,847    
Fair value   7,700    
ATX Networks Corp.        
Schedule of Investments [Line Items]        
Cost [11]   8,499    
Fair value [11]   12,211    
Flame King Holdings, LLC        
Schedule of Investments [Line Items]        
Cost   38,975    
Fair value   46,380    
Rocaceia, LLC (Quality Lease and Rental Holdings, LLC)        
Schedule of Investments [Line Items]        
Cost   32,365    
Fair value   0    
Sonic Systems International, LLC        
Schedule of Investments [Line Items]        
Cost [6]   16,883    
Fair value [6]   17,049    
Independent Pet Partners Intermediate Holdings, LLC        
Schedule of Investments [Line Items]        
Cost [6]   30,253    
Fair value [6]   15,429    
Control investments        
Schedule of Investments [Line Items]        
Cost 1,377,194 [2],[19] 1,270,802 [1],[20]    
Fair value $ 1,883,699 [4],[19] $ 1,703,172 [3],[20] 1,538,158 $ 1,489,257
Investment owned, percent of net assets 83.50% 80.80%    
Affiliate investments        
Schedule of Investments [Line Items]        
Cost $ 539,826 [2],[21] $ 635,536 [1],[22]    
Fair value $ 563,125 [4],[21] $ 618,359 [3],[22] 518,061 549,214
Investment owned, percent of net assets 25.00% 29.30%    
Non‑Control/Non‑Affiliate investments        
Schedule of Investments [Line Items]        
Cost $ 1,825,669 $ 1,867,414 [1],[23] 1,825,669 [2],[24]  
Fair value $ 1,763,719 $ 1,780,646 [3],[23] 1,763,719 [4],[24]  
Investment owned, percent of net assets 78.20% 84.40%    
Investment, Identifier [Axis]: 2717 MH, L.P., LP Interests (2717 HPP-MS, L.P.)        
Schedule of Investments [Line Items]        
Fair value $ 315 $ 248 244 0
Investment, Identifier [Axis]: 2717 MH, L.P., LP Interests (2717 MH, L.P.)        
Schedule of Investments [Line Items]        
Fair value 6,346 7,552 6,554 3,971
Investment, Identifier [Axis]: 423 HAR, LP, LP Interests (423 HAR, L.P.)        
Schedule of Investments [Line Items]        
Fair value $ 750 $ 0    
Investment, Identifier [Axis]: AAC Holdings, Inc., Common Stock        
Schedule of Investments [Line Items]        
Units (in shares) 593,928 [12] 593,928 [11]    
Cost $ 3,148 [12] $ 3,148 [11]    
Fair value $ 0 [12] $ 0 [11] $ 800 2,079
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt        
Schedule of Investments [Line Items]        
Total Rate   18.00% [11] 18.00%  
PIK Rate   18.00% [11] 8.00%  
Principal [11]   $ 11,726    
Cost [11]   11,590    
Fair value   11,550 [11] $ 10,090 9,794
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [12] 18.00%      
PIK Rate [12] 18.00%      
Principal [12] $ 381      
Cost [12] 376      
Fair value $ 360 [12] 0    
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [12] 18.00%      
PIK Rate [12] 18.00%      
Principal [12] $ 12,848      
Cost [12] 12,739      
Fair value $ 12,141 [12] $ 11,550    
Investment, Identifier [Axis]: AAC Holdings, Inc., Warrants        
Schedule of Investments [Line Items]        
Units (in shares) 554,353 [12],[25] 554,353 [11],[26]    
Cost $ 0 [12],[25] $ 0 [11],[26]    
Fair value $ 0 [12],[25] $ 0 [11],[26] 740 1,940
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 1        
Schedule of Investments [Line Items]        
Reference Rate and Spread 5.00% [5],[14],[27] 6.00% [6],[28],[29],[30]    
Principal $ 0 [5],[14],[27] $ 0 [6],[28],[29],[30]    
Cost (68) [5],[14],[27] (39) [6],[28],[29],[30]    
Fair value $ (68) [5],[14],[27] $ (39) [6],[28],[29],[30]    
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [6],[28],[29]   10.20%    
Reference Rate and Spread 6.00% [5],[14],[17],[27] 6.00% [6],[28],[29]    
Principal $ 0 [5],[14],[17],[27] $ 741 [6],[28],[29]    
Cost (83) [5],[14],[17],[27] 653 [6],[28],[29]    
Fair value $ 0 [5],[14],[17],[27] $ 741 [6],[28],[29]    
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.20% [5],[14],[17] 10.58% [6],[28],[29]    
Reference Rate and Spread 6.00% [5],[14],[17] 6.00% [6],[28],[29]    
Principal $ 21,296 [5],[14],[17] $ 17,052 [6],[28],[29]    
Cost 20,736 [5],[14],[17] 16,602 [6],[28],[29]    
Fair value $ 21,296 [5],[14],[17] $ 17,052 [6],[28],[29]    
Investment, Identifier [Axis]: ADS Tactical, Inc., Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 10.94% [12],[14],[17] 10.14% [11],[29]    
Reference Rate and Spread 5.75% [12],[14],[17] 5.75% [11],[29]    
Principal $ 20,424 [12],[14],[17] $ 21,077 [11],[29]    
Cost 20,181 [12],[14],[17] 20,781 [11],[29]    
Fair value 19,492 [12],[14],[17] $ 18,969 [11],[29]    
Investment, Identifier [Axis]: AFG Capital Group, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Units (in shares) [31]   186    
Cost [31]   $ 1,200    
Fair value $ 0 $ 9,400 [31] $ 8,780 7,740
Investment, Identifier [Axis]: AFG Capital Group, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate     10.00%  
Fair value     $ 0 144
Investment, Identifier [Axis]: AMEREQUIP LLC., Common Stock        
Schedule of Investments [Line Items]        
Units (in shares) 235 [5],[32] 235 [6]    
Cost $ 1,844 [5],[32] $ 1,779 [6]    
Fair value $ 1,930 [5],[32] $ 1,779 [6]    
Investment, Identifier [Axis]: AMEREQUIP LLC., Secured Debt 1        
Schedule of Investments [Line Items]        
Reference Rate and Spread 7.40% [5],[14],[17],[27] 7.40% [6],[28],[29],[30]    
Principal $ 0 [5],[14],[17],[27] $ 0 [6],[28],[29],[30]    
Cost (122) [5],[14],[17],[27] (137) [6],[28],[29],[30]    
Fair value $ (122) [5],[14],[17],[27] $ (137) [6],[28],[29],[30]    
Investment, Identifier [Axis]: AMEREQUIP LLC., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.70% [5],[14],[17] 11.72% [6],[28],[29]    
Reference Rate and Spread 7.40% [5],[14],[17] 7.40% [6],[28],[29]    
Principal $ 37,264 [5],[14],[17] $ 37,491 [6],[28],[29]    
Cost 36,665 [5],[14],[17] 36,819 [6],[28],[29]    
Fair value $ 37,264 [5],[14],[17] $ 37,463 [6],[28],[29]    
Investment, Identifier [Axis]: ASC Interests, LLC, Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 1,500 1,500    
Cost $ 1,594 $ 1,500    
Fair value $ 510 $ 800 $ 800 720
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 13.00% 13.00% 13.00%  
Principal $ 400 $ 400    
Cost 400 400    
Fair value $ 400 $ 400 $ 170 200
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.00% 13.00% 13.00%  
Principal $ 1,650 $ 1,650    
Cost 1,649 1,649    
Fair value $ 1,597 $ 1,649 $ 1,648 1,636
Investment, Identifier [Axis]: ATS Operating, LLC, Common Stock        
Schedule of Investments [Line Items]        
Units (in shares) 720,000 [5] 720,000 [6]    
Cost $ 720 [5] $ 720 [6]    
Fair value $ 660 [5] $ 660 [6]    
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [5],[14],[17] 11.75%      
Reference Rate and Spread 6.50% [5],[14],[17] 5.50% [6],[28],[29],[30]    
Principal $ 720 [5],[14],[17] $ 0 [6],[28],[29],[30]    
Cost 720 [5],[14],[17] 0 [6],[28],[29],[30]    
Fair value $ 720 [5],[14],[17] $ 0 [6],[28],[29],[30]    
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.65% [5],[14],[17] 9.32% [6],[28],[29]    
Reference Rate and Spread 5.50% [5],[14],[17] 5.50% [6],[28],[29]    
Principal $ 6,660 [5],[14],[17] $ 6,660 [6],[28],[29]    
Cost 6,660 [5],[14],[17] 6,660 [6],[28],[29]    
Fair value $ 6,660 [5],[14],[17] $ 6,582 [6],[28],[29]    
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 12.65% [5],[14],[17] 11.32% [6],[28],[29]    
Reference Rate and Spread 7.50% [5],[14],[17] 7.50% [6],[28],[29]    
Principal $ 6,660 [5],[14],[17] $ 6,660 [6],[28],[29]    
Cost 6,660 [5],[14],[17] 6,660 [6],[28],[29]    
Fair value $ 6,660 [5],[14],[17] $ 6,593 [6],[28],[29]    
Investment, Identifier [Axis]: ATS Workholding, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 3,725,862 [5] 3,725,862 [6]    
Cost $ 3,726 [5] $ 3,726 [6]    
Fair value $ 0 [5] $ 0 [6]    
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate     5.00%  
Fair value     $ 2,939 3,005
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 5.00% [5],[16] 5.00% [6],[33]    
Principal $ 2,027 [5],[16] $ 1,901 [6],[33]    
Cost 2,027 [5],[16] 1,901 [6],[33]    
Fair value $ 483 [5],[16] $ 634 [6],[33]    
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 5.00% [5],[16] 5.00% [6],[33]    
Principal $ 3,015 [5],[16] $ 3,015 [6],[33]    
Cost 2,855 [5],[16] 2,857 [6],[33]    
Fair value 719 [5],[16] $ 1,005 [6],[33]    
Investment, Identifier [Axis]: ATX Networks Corp., Common Stock        
Schedule of Investments [Line Items]        
Units (in shares) [11]   583    
Cost [11]   $ 0    
Fair value $ 0 $ 3,270 [11]    
Investment, Identifier [Axis]: ATX Networks Corp., Secured Debt        
Schedule of Investments [Line Items]        
Total Rate   12.23% [11],[29] 8.92%  
Reference Rate and Spread 7.50% 7.50% [11],[29] 7.50%  
Principal [11],[29]   $ 6,783    
Cost [11],[29]   6,208    
Fair value $ 0 $ 6,343 [11],[29] $ 6,187 7,092
Investment, Identifier [Axis]: ATX Networks Corp., Unsecured Debt        
Schedule of Investments [Line Items]        
Total Rate   10.00% [11] 10.00%  
PIK Rate   10.00% [11] 10.00%  
Principal [11]   $ 3,396    
Cost [11]   2,291    
Fair value $ 0 $ 2,598 [11] $ 2,242 1,963
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Common Equity        
Schedule of Investments [Line Items]        
Units (in shares) 984 [5] 360 [6]    
Cost $ 965 [5] $ 360 [6]    
Fair value $ 1,011 [5] $ 406 [6]    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [5],[14],[17] 12.63%      
Reference Rate and Spread 7.25% [5],[14],[17] 7.25% [6],[28],[29],[30]    
Principal $ 1,474 [5],[14],[17] $ 0 [6],[28],[29],[30]    
Cost 1,339 [5],[14],[17] (57) [6],[28],[29],[30]    
Fair value $ 1,425 [5],[14],[17] $ (57) [6],[28],[29],[30]    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.65% [5],[14],[17] 12.17% [6],[28],[29]    
Reference Rate and Spread 7.25% [5],[14],[17] 7.25% [6],[28],[29]    
Principal $ 19,346 [5],[14],[17] $ 29,071 [6],[28],[29]    
Cost 18,855 [5],[14],[17] 27,927 [6],[28],[29]    
Fair value $ 18,714 [5],[14],[17] $ 27,927 [6],[28],[29]    
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 15.75% [5],[14] 13.23% [6],[29]    
Reference Rate and Spread 7.50% [5],[14] 8.50% [6],[29]    
Principal $ 1,678 [5],[14] $ 1,678 [6],[29]    
Cost 1,673 [5],[14] 1,669 [6],[29]    
Fair value $ 1,678 [5],[14] $ 1,678 [6],[29]    
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 15.75% [5],[14] 13.23% [6],[29]    
Reference Rate and Spread 7.50% [5],[14] 8.50% [6],[29]    
Principal $ 9,620 [5],[14] $ 9,891 [6],[29]    
Cost 9,567 [5],[14] 9,825 [6],[29]    
Fair value $ 9,620 [5],[14] $ 9,891 [6],[29]    
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 19.75% [5],[14] 16.17% [6],[29]    
Reference Rate and Spread 11.50% [5],[14] 12.50% [6],[29]    
Principal $ 785 [5],[14] $ 807 [6],[29]    
Cost 780 [5],[14] 800 [6],[29]    
Fair value $ 785 [5],[14] $ 807 [6],[29]    
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [6],[29]   13.88%    
Reference Rate and Spread 7.50% [5],[14],[17],[27] 9.50% [6],[29]    
Principal $ 0 [5],[14],[17],[27] $ 14,618 [6],[29]    
Cost (30) [5],[14],[17],[27] 14,291 [6],[29]    
Fair value $ (30) [5],[14],[17],[27] $ 14,618 [6],[29]    
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.85% [5],[14],[17] 13.57% [6],[29]    
Reference Rate and Spread 7.50% [5],[14],[17] 9.00% [6],[29]    
Principal $ 43,656 [5],[14],[17] $ 4,368 [6],[29]    
Cost 43,162 [5],[14],[17] 4,270 [6],[29]    
Fair value $ 43,162 [5],[14],[17] $ 4,368 [6],[29]    
Investment, Identifier [Axis]: Acumera, Inc., Warrants        
Schedule of Investments [Line Items]        
Units (in shares) [5],[34] 47,352      
Cost [5],[34] $ 0      
Fair value [5],[34] $ 0      
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 10.00% [5],[14],[17],[35] 10.00% [6],[29],[36]    
Reference Rate and Spread 7.00% [5],[14],[17],[35] 6.00% [6],[29],[36]    
Principal $ 7,094 [5],[14],[17],[35] $ 4,729 [6],[29],[36]    
Cost 7,094 [5],[14],[17],[35] 4,729 [6],[29],[36]    
Fair value $ 6,976 [5],[14],[17],[35] $ 4,729 [6],[29],[36]    
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.00% [5],[14],[17],[35] 10.00% [6],[29],[36]    
Reference Rate and Spread 7.00% [5],[14],[17],[35] 7.50% [6],[29],[36]    
Principal $ 22,383 [5],[14],[17],[35] $ 24,086 [6],[29],[36]    
Cost 22,337 [5],[14],[17],[35] 24,033 [6],[29],[36]    
Fair value $ 22,383 [5],[14],[17],[35] $ 24,086 [6],[29],[36]    
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Reference Rate and Spread 6.00% [5],[14],[27] 6.00% [6],[29],[30]    
Principal $ 0 [5],[14],[27] $ 0 [6],[29],[30]    
Cost (9) [5],[14],[27] (10) [6],[29],[30]    
Fair value $ (9) [5],[14],[27] $ (10) [6],[29],[30]    
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.43% [5],[14] 11.12% [6],[29]    
Reference Rate and Spread 6.00% [5],[14] 6.00% [6],[29]    
Principal $ 6,583 [5],[14] $ 6,617 [6],[29]    
Cost 6,538 [5],[14] 6,565 [6],[29]    
Fair value $ 6,583 [5],[14] $ 6,617 [6],[29]    
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.79% [5],[14],[17] 10.46% [6],[28],[29]    
Reference Rate and Spread 6.75% [5],[14],[17] 6.75% [6],[28],[29]    
Principal $ 14,800 [5],[14],[17] $ 15,628 [6],[28],[29]    
Cost 14,625 [5],[14],[17] 15,408 [6],[28],[29]    
Fair value $ 12,216 [5],[14],[17] $ 14,606 [6],[28],[29]    
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 14.79% [5],[14],[16],[17] 12.46% [6],[28],[29]    
Reference Rate and Spread 8.75% [5],[14],[16],[17] 8.75% [6],[28],[29]    
PIK Rate [5],[14],[16],[17] 1.00%      
Principal $ 14,800 [5],[14],[16],[17] $ 15,628 [6],[28],[29]    
Cost 14,625 [5],[14],[16],[17] 15,408 [6],[28],[29]    
Fair value $ 10,618 [5],[14],[16],[17] $ 14,654 [6],[28],[29]    
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 7.50% [12],[15],[16] 7.50% [11],[33]    
Reference Rate and Spread 6.50% [12],[15],[16] 6.50% [11],[33]    
Principal $ 2,980 [12],[15],[16] $ 2,980 [11],[33]    
Cost 2,980 [12],[15],[16] 2,980 [11],[33]    
Fair value $ 135 [12],[15],[16] $ 168 [11],[33]    
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 7.50% [12],[14],[15],[16] 7.50% [11],[29],[33]    
Reference Rate and Spread 6.50% [12],[14],[15],[16] 6.50% [11],[29],[33]    
Principal $ 14,370 [12],[14],[15],[16] $ 14,370 [11],[29],[33]    
Cost 13,706 [12],[14],[15],[16] 13,706 [11],[29],[33]    
Fair value 647 [12],[14],[15],[16] 808 [11],[29],[33]    
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]        
Fair value 0 14,914 0 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]        
Fair value $ 0 $ (14,914) 0 41,748
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Fair value     $ 4,318 4,894
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 1        
Schedule of Investments [Line Items]        
Units (in shares) 3,200 3,200    
Total Rate 14.13% 14.13%    
Cost $ 3,200 $ 3,200    
Fair value $ 0 $ 0    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units 2        
Schedule of Investments [Line Items]        
Units (in shares) 2,427 2,427    
Cost $ 2,427 $ 2,427    
Fair value $ 4,070 $ 3,504    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate     12.00%  
Reference Rate and Spread     10.00%  
Fair value     $ 4,641 4,736
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Reference Rate and Spread 10.00% [14],[27] 10.00% [29],[30]    
Principal $ 0 [14],[27] $ 0 [29],[30]    
Cost (2) [14],[27] (3) [29],[30]    
Fair value $ (2) [14],[27] $ (3) [29],[30]    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 15.25% [14] 14.13% [29]    
Reference Rate and Spread 10.00% [14] 10.00% [29]    
Principal $ 4,525 [14] $ 4,665 [29]    
Cost 4,444 [14] 4,545 [29]    
Fair value $ 4,444 [14] $ 4,545 [29]    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Warrants        
Schedule of Investments [Line Items]        
Units (in shares) 420 [25] 420 [26]    
Cost $ 316 [25] $ 316 [26]    
Fair value $ 0 [25] $ 0 [26]    
Investment, Identifier [Axis]: ArborWorks, LLC, Common Equity        
Schedule of Investments [Line Items]        
Units (in shares) 234 [5] 234 [6]    
Cost $ 234 [5] $ 234 [6]    
Fair value $ 0 [5] $ 0 [6]    
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 15.25% [5],[14],[17] 13.41% [6],[29]    
Reference Rate and Spread 7.00% [5],[14],[17] 9.00% [6],[29]    
PIK Rate [5],[14],[17] 3.00%      
Principal $ 4,928 [5],[14],[17] $ 4,678 [6],[29]    
Cost 4,833 [5],[14],[17] 4,569 [6],[29]    
Fair value $ 3,799 [5],[14],[17] $ 3,945 [6],[29]    
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 15.23% [5],[14],[17] 13.56% [6],[29]    
Reference Rate and Spread 7.00% [5],[14],[17] 9.00% [6],[29]    
PIK Rate [5],[14],[17] 14.40%      
Principal $ 29,789 [5],[14],[17] $ 29,722 [6],[29]    
Cost 29,362 [5],[14],[17] 29,261 [6],[29]    
Fair value $ 22,962 [5],[14],[17] $ 25,065 [6],[29]    
Investment, Identifier [Axis]: Archer Systems, LLC, Common Stock        
Schedule of Investments [Line Items]        
Units (in shares) 1,387,832 [5] 1,387,832 [6]    
Cost $ 1,388 [5] $ 1,388 [6]    
Fair value $ 1,940 [5] $ 1,388 [6]    
Investment, Identifier [Axis]: Archer Systems, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Reference Rate and Spread 6.00% [5],[14],[17],[27] 6.50% [6],[28],[29],[30]    
Principal $ 0 [5],[14],[17],[27] $ 0 [6],[28],[29],[30]    
Cost (121) [5],[14],[17],[27] (135) [6],[28],[29],[30]    
Fair value $ (121) [5],[14],[17],[27] $ (135) [6],[28],[29],[30]    
Investment, Identifier [Axis]: Archer Systems, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.39% [5],[14],[17] 10.92% [6],[28],[29]    
Reference Rate and Spread 6.00% [5],[14],[17] 6.50% [6],[28],[29]    
Principal $ 53,233 [5],[14],[17] $ 67,597 [6],[28],[29]    
Cost 52,304 [5],[14],[17] 66,330 [6],[28],[29]    
Fair value $ 52,846 [5],[14],[17] $ 66,511 [6],[28],[29]    
Investment, Identifier [Axis]: Arrow International, Inc, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate [6],[28],[29],[37]   10.36%    
Reference Rate and Spread [6],[28],[29],[37]   6.60%    
Principal [6],[28],[29],[37]   $ 36,000    
Cost [6],[28],[29],[37]   35,737    
Fair value [6],[28],[29],[37]   $ 36,000    
Investment, Identifier [Axis]: BBB Tank Services, LLC, Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 800,000 800,000    
Cost $ 800 $ 800    
Fair value $ 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%    
Cost $ 162 $ 162    
Fair value $ 0 $ 0 $ 0 0
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt        
Schedule of Investments [Line Items]        
Total Rate     12.06%  
Reference Rate and Spread     11.00%  
Fair value     $ 2,298 2,507
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 16.17% [14],[15] 15.12% [29],[38]    
Reference Rate and Spread 11.00% [14],[15] 11.00% [29],[38]    
Principal $ 800 [14],[15] $ 800 [29],[38]    
Cost 800 [14],[15] 800 [29],[38]    
Fair value $ 800 [14],[15] $ 800 [29],[38]    
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 16.17% [14],[15] 15.12% [29],[38]    
Reference Rate and Spread 11.00% [14],[15] 11.00% [29],[38]    
Principal $ 4,000 [14],[15] $ 4,000 [29],[38]    
Cost 4,000 [14],[15] 4,000 [29],[38]    
Fair value $ 2,202 [14],[15] $ 2,086 [29],[38]    
Investment, Identifier [Axis]: Barfly Ventures, LLC, Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 37 [5] 37 [6]    
Cost $ 1,584 [5] $ 1,584 [6]    
Fair value $ 3,040 [5] $ 3,320 [6] $ 2,400 1,930
Investment, Identifier [Axis]: Barfly Ventures, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 7.00% [5] 7.00% [6] 7.00%  
Principal $ 711 [5] $ 711 [6]    
Cost 711 [5] 711 [6]    
Fair value $ 711 [5] $ 711 [6] $ 711 711
Investment, Identifier [Axis]: Batjer TopCo, LLC, Member Units        
Schedule of Investments [Line Items]        
Fair value     $ 4,073 0
Investment, Identifier [Axis]: Batjer TopCo, LLC, Preferred Stock        
Schedule of Investments [Line Items]        
Units (in shares) 4,073 [32] 4,073 [31]    
Cost $ 4,095 [32] $ 4,095 [31]    
Fair value 6,150 [32] 4,095 [31]    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate     11.00%  
Fair value     $ 10,913 0
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Principal 0 [27] 0 [30]    
Cost (7) [27] (8) [30]    
Fair value $ 0 [27] (8) [30]    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.00%      
Principal $ 10,575 0 [30]    
Cost 10,497 0 [30]    
Fair value 10,575 0 [30]    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 2.1        
Schedule of Investments [Line Items]        
Fair value $ 0 $ 0    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.00% 11.00%    
Principal   $ 11,025    
Cost   10,933    
Fair value $ 10,575 $ 10,933    
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 1        
Schedule of Investments [Line Items]        
Units (in shares) 1,548,387 [5],[32],[39] 1,548,387 [6],[31],[40]    
Total Rate [6],[31],[40]   8.00%    
PIK Rate [6],[31],[40]   8.00%    
Cost $ 0 [5],[32],[39] $ 1,161 [6],[31],[40]    
Fair value $ 3,940 [5],[32],[39] $ 4,561 [6],[31],[40]    
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units 2        
Schedule of Investments [Line Items]        
Units (in shares) 122,416 [5],[32],[39] 122,416 [6],[30],[31],[40]    
PIK Rate [6],[30],[31],[40]   16.00%    
Cost $ 0 [5],[32],[39] $ 0 [6],[30],[31],[40]    
Fair value $ 310 [5],[32],[39] $ 270 [6],[30],[31],[40]    
Investment, Identifier [Axis]: Berry Aviation, Inc., Secured Debt        
Schedule of Investments [Line Items]        
Total Rate [6]   12.00%    
PIK Rate [6]   1.50%    
Principal [6]   $ 195    
Cost [6]   195    
Fair value [6]   $ 195    
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Reference Rate and Spread 7.00% [5],[14],[17],[27] 1.00% [6],[28],[29],[30]    
PIK Rate [6],[28],[29],[30]   6.00%    
Principal $ 0 [5],[14],[17],[27] $ 0 [6],[28],[29],[30]    
Cost (69) [5],[14],[17],[27] (76) [6],[28],[29],[30]    
Fair value $ (69) [5],[14],[17],[27] $ (76) [6],[28],[29],[30]    
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.26% [5],[14],[17] 11.40% [6],[28],[29]    
Reference Rate and Spread 7.00% [5],[14],[17] 1.00% [6],[28],[29]    
PIK Rate 6.00% [5],[14],[17] 6.00% [6],[28],[29]    
Principal $ 28,345 [5],[14],[17] $ 27,505 [6],[28],[29]    
Cost 27,904 [5],[14],[17] 27,020 [6],[28],[29]    
Fair value $ 28,345 [5],[14],[17] $ 27,505 [6],[28],[29]    
Investment, Identifier [Axis]: Binswanger Enterprises, LLC, Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 1,050,000 [5] 1,050,000 [6]    
Cost $ 1,050 [5] $ 1,050 [6]    
Fair value $ 180 [5] $ 420 [6]    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Common Stock        
Schedule of Investments [Line Items]        
Units (in shares) 723,184 [12] 723,184 [11],[31]    
Cost $ 1 [12] $ 1 [11],[31]    
Fair value $ 2,265 [12] $ 4,860 [11],[31]    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [12],[14] 15.75%      
Reference Rate and Spread 7.50% [12],[14] 8.50% [11],[29],[30]    
PIK Rate [12],[14] 14.75%      
Principal $ 1,418 [12],[14] $ 0 [11],[29],[30]    
Cost 1,418 [12],[14] 0 [11],[29],[30]    
Fair value $ 1,333 [12],[14] $ 0 [11],[29],[30]    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.77% [12],[14],[17] 12.94% [11],[29]    
Reference Rate and Spread 8.50% [12],[14],[17] 8.50% [11],[29]    
PIK Rate [12],[14],[17] 12.77%      
Principal $ 3,415 [12],[14],[17] $ 3,239 [11],[29]    
Cost 2,635 [12],[14],[17] 2,280 [11],[29]    
Fair value $ 3,210 [12],[14],[17] $ 3,139 [11],[29]    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Warrants        
Schedule of Investments [Line Items]        
Units (in shares) 163,295 [12],[25] 163,295 [11],[26]    
Cost $ 1,036 [12],[25] $ 1,036 [11],[26]    
Fair value $ 510 [12],[25] $ 1,095 [11],[26]    
Investment, Identifier [Axis]: Boccella Precast Products LLC, Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 2,160,000 2,160,000 [31]    
Cost $ 2,256 $ 2,256 [31]    
Fair value $ 2,350 $ 2,970 [31] $ 4,510 4,830
Investment, Identifier [Axis]: Boccella Precast Products LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 10.00% 10.00% 10.00%  
Principal $ 320 $ 320    
Cost 320 320    
Fair value $ 320 $ 320 $ 320 320
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Class B Preferred Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 140,000 [32] 140,000 [31]    
Total Rate 8.00% [32] 8.00% [31]    
Cost $ 14,000 [32] $ 14,000 [31]    
Fair value $ 31,120 [32] $ 31,420 [31] $ 25,930 23,170
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 14.37% [14],[17],[41] 13.39% [28],[29],[42] 10.50%  
Reference Rate and Spread 9.19% [14],[17],[41] 9.26% [28],[29],[42] 9.00%  
Principal $ 97,875 [14],[17],[41] $ 99,194 [28],[29],[42]    
Cost 97,328 [14],[17],[41] 98,576 [28],[29],[42]    
Fair value 97,875 [14],[17],[41] 99,194 [28],[29],[42] $ 49,194 39,000
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Fair value $ 0 0    
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 14.37%      
Reference Rate and Spread 9.19%      
Fair value $ 97,875 $ 99,194    
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Common Equity        
Schedule of Investments [Line Items]        
Units (in shares) [5],[8],[13] 571      
Cost [5],[8],[13] $ 571      
Fair value [5],[8],[13] $ 571      
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 1        
Schedule of Investments [Line Items]        
Reference Rate and Spread [5],[8],[13],[14],[17],[27] 7.00%      
Principal [5],[8],[13],[14],[17],[27] $ 0      
Cost [5],[8],[13],[14],[17],[27] (28)      
Fair value [5],[8],[13],[14],[17],[27] $ (28)      
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [5],[8],[13],[14],[17] 11.19%      
Reference Rate and Spread [5],[8],[13],[14],[17] 6.00%      
Principal [5],[8],[13],[14],[17] $ 6,421      
Cost [5],[8],[13],[14],[17] 6,297      
Fair value [5],[8],[13],[14],[17] $ 6,297      
Investment, Identifier [Axis]: Bond Brand Loyalty ULC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [5],[8],[13],[14],[17] 13.19%      
Reference Rate and Spread [5],[8],[13],[14],[17] 8.00%      
Principal [5],[8],[13],[14],[17] $ 6,421      
Cost [5],[8],[13],[14],[17] 6,297      
Fair value [5],[8],[13],[14],[17] $ 6,297      
Investment, Identifier [Axis]: Brainworks Software, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 12.50% [5],[14],[15],[16] 12.50% [6],[29],[33],[38]    
Reference Rate and Spread 9.25% [5],[14],[15],[16] 9.25% [6],[29],[33],[38]    
Principal $ 761 [5],[14],[15],[16] $ 761 [6],[29],[33],[38]    
Cost 761 [5],[14],[15],[16] 761 [6],[29],[33],[38]    
Fair value $ 761 [5],[14],[15],[16] $ 761 [6],[29],[33],[38]    
Investment, Identifier [Axis]: Brainworks Software, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.50% [5],[14],[15],[16] 12.50% [6],[29],[33],[38]    
Reference Rate and Spread 9.25% [5],[14],[15],[16] 9.25% [6],[29],[33],[38]    
Principal $ 7,056 [5],[14],[15],[16] $ 7,056 [6],[29],[33],[38]    
Cost 7,056 [5],[14],[15],[16] 7,056 [6],[29],[33],[38]    
Fair value $ 1,382 [5],[14],[15],[16] $ 2,916 [6],[29],[33],[38]    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 2,950 [32] 2,950 [31]    
Cost $ 4,280 [32] $ 4,280 [31]    
Fair value $ 6,360 [32] $ 7,080 [31] $ 7,050 7,710
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 15.17% [14] 14.12% [29] 11.06%  
Reference Rate and Spread 10.00% [14] 10.00% [29] 10.00%  
Principal $ 5,716 [14] $ 5,964 [29]    
Cost 5,716 [14] 5,964 [29]    
Fair value 5,653 [14] $ 5,964 [29] $ 7,801 8,037
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Preferred Member Units        
Schedule of Investments [Line Items]        
Units (in shares) [31],[40]   17,742    
Cost [31],[40]   $ 1,000    
Fair value $ 1,000 $ 1,000 [31],[40] $ 1,000 1,000
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Preferred Member Units 2        
Schedule of Investments [Line Items]        
Units (in shares) [32],[39] 17,742      
Cost [32],[39] $ 1,000      
Fair value [32],[39] $ 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%  
Principal $ 8,813 $ 8,813    
Cost 8,813 8,813    
Fair value $ 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% [39] 13.00% [40] 13.00%  
Principal $ 1,000 [39] $ 1,000 [40]    
Cost 1,000 [39] 1,000 [40]    
Fair value $ 1,000 [39] $ 1,000 [40] $ 1,000 1,000
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants        
Schedule of Investments [Line Items]        
Units (in shares) 82 [25] 82 [26]    
Cost $ 2,132 [25] $ 2,132 [26]    
Fair value 4,450 [25] 4,340 [26] $ 4,260 4,060
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants 1        
Schedule of Investments [Line Items]        
Fair value 1,874 1,828    
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants 2        
Schedule of Investments [Line Items]        
Fair value $ 2,576 $ 2,512    
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund III, LP)        
Schedule of Investments [Line Items]        
Units (percentage) 1.55% [7],[8],[43] 1.55% [9],[10],[31],[44]    
Cost $ 7,062 [7],[8],[43] $ 7,062 [9],[10],[31],[44]    
Fair value $ 4,586 [7],[8],[43] $ 4,727 [9],[10],[31],[44]    
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund IV, LP)        
Schedule of Investments [Line Items]        
Units (percentage) 0.59% [7],[8],[32],[43] 0.59% [9],[10],[31],[44]    
Cost $ 4,350 [7],[8],[32],[43] $ 4,350 [9],[10],[31],[44]    
Fair value $ 4,589 [7],[8],[32],[43] $ 4,541 [9],[10],[31],[44]    
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund V, LP)        
Schedule of Investments [Line Items]        
Units (percentage) 1.31% [7],[8],[32],[43] 1.31% [9],[10],[44]    
Cost $ 2,000 [7],[8],[32],[43] $ 2,000 [9],[10],[44]    
Fair value $ 2,331 [7],[8],[32],[43] $ 2,229 [9],[10],[44]    
Investment, Identifier [Axis]: Buca C, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 6 6    
Total Rate 6.00% 6.00%    
PIK Rate 6.00% 6.00%    
Cost $ 4,770 $ 4,770    
Fair value $ 0 $ 0    
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 12.00% 9.00% 10.37%  
Reference Rate and Spread     9.25%  
Principal $ 16,980 $ 17,355    
Cost 16,980 17,355    
Fair value $ 11,964 $ 12,337 $ 13,149 14,370
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [5],[14],[17] 10.20%      
Reference Rate and Spread 5.00% [5],[14],[17] 5.00% [6],[29],[30]    
Principal $ 774 [5],[14],[17] $ 0 [6],[29],[30]    
Cost 751 [5],[14],[17] (28) [6],[29],[30]    
Fair value $ 774 [5],[14],[17] $ 0 [6],[29],[30]    
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 10.20% [5],[14],[17] 8.91% [6],[29]    
Reference Rate and Spread 5.00% [5],[14],[17] 5.00% [6],[29]    
Principal $ 19,782 [5],[14],[17] $ 19,933 [6],[29]    
Cost 19,530 [5],[14],[17] 19,656 [6],[29]    
Fair value $ 19,782 [5],[14],[17] $ 19,933 [6],[29]    
Investment, Identifier [Axis]: CAI Software LLC, Preferred Equity 1        
Schedule of Investments [Line Items]        
Units (in shares) 1,788,527 1,788,527 [31]    
Cost $ 1,789 $ 1,789 [31]    
Fair value $ 1,789 $ 1,789 [31]    
Investment, Identifier [Axis]: CAI Software LLC, Preferred Equity 2        
Schedule of Investments [Line Items]        
Units (in shares) 596,176 596,176    
Cost $ 0 $ 0    
Fair value $ 0 $ 0    
Investment, Identifier [Axis]: CBT Nuggets, LLC, Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 416 [32] 416 [31]    
Cost $ 1,300 [32] $ 1,300 [31]    
Fair value 50,570 [32] $ 49,002 [31] 47,900 50,620
Investment, Identifier [Axis]: CMS Minerals Investments, Member Units        
Schedule of Investments [Line Items]        
Units (in shares) [31],[40]   100    
Cost [31],[40]   $ 1,304    
Fair value $ 0 $ 1,670 [31],[40] 2,274 1,974
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate [6],[29],[45]   11.99%    
Reference Rate and Spread [6],[29],[45]   8.50%    
PIK Rate [6],[29],[45]   0.01%    
Principal [6],[29],[45]   $ 28,328    
Cost [6],[29],[45]   28,264    
Fair value [6],[29],[45]   $ 28,328    
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [5],[14],[17] 13.91%      
Reference Rate and Spread [5],[14],[17] 6.50%      
PIK Rate [5],[14],[17] 2.00%      
Principal [5],[14],[17] $ 5,044      
Cost [5],[14],[17] 5,038      
Fair value [5],[14],[17] $ 5,044      
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate [5],[14],[17] 13.91%      
Reference Rate and Spread [5],[14],[17] 6.50%      
PIK Rate [5],[14],[17] 2.00%      
Principal [5],[14],[17] $ 1,569      
Cost [5],[14],[17] 1,568      
Fair value [5],[14],[17] $ 1,569      
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [5],[14],[17] 13.91%      
Reference Rate and Spread [5],[14],[17] 6.50%      
PIK Rate [5],[14],[17] 2.00%      
Principal [5],[14],[17] $ 2,064      
Cost [5],[14],[17] 2,062      
Fair value [5],[14],[17] $ 2,064      
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt 4        
Schedule of Investments [Line Items]        
Total Rate [5],[14],[17] 13.91%      
Reference Rate and Spread [5],[14],[17] 6.50%      
PIK Rate [5],[14],[17] 2.00%      
Principal [5],[14],[17] $ 594      
Cost [5],[14],[17] 593      
Fair value [5],[14],[17] $ 594      
Investment, Identifier [Axis]: Café Brazil, LLC, Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 1,233 [32] 1,233 [31]    
Cost $ 1,742 [32] $ 1,742 [31]    
Fair value $ 2,130 [32] $ 2,210 [31] $ 2,520 2,570
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units 1        
Schedule of Investments [Line Items]        
Units (in shares) 6,157 [32] 6,157 [31]    
Total Rate     15.00%  
PIK Rate     15.00%  
Cost $ 10,775 [32] $ 10,775 [31]    
Fair value $ 23,435 [32] $ 25,495 [31] $ 3,713 9,510
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units 2        
Schedule of Investments [Line Items]        
Units (in shares) 3,671 [32] 3,671 [31]    
Total Rate 15.00% [32] 15.00% [31]    
PIK Rate 15.00% [32] 15.00% [31]    
Cost $ 4,295 [32] $ 3,994 [31]    
Fair value $ 4,295 [32] $ 3,994 [31] $ 19,295 13,275
Investment, Identifier [Axis]: California Splendor Holdings LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 15.25% [14] 13.75% [29] 11.00%  
Reference Rate and Spread 10.00% [14] 10.00% [29] 10.00%  
Principal $ 28,000 [14] $ 28,000 [29]    
Cost 27,958 [14] 27,951 [29]    
Fair value $ 28,000 [14] $ 28,000 [29] $ 28,000 27,915
Investment, Identifier [Axis]: Camin Cargo Control, Inc., Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 11.72% [12],[14],[17] 10.88% [11],[29]    
Reference Rate and Spread 6.50% [12],[14],[17] 6.50% [11],[29]    
Principal $ 15,138 [12],[14],[17] $ 15,218 [11],[29]    
Cost 15,047 [12],[14],[17] 15,110 [11],[29]    
Fair value $ 14,608 [12],[14],[17] $ 14,685 [11],[29]    
Investment, Identifier [Axis]: Career Team Holdings, LLC, Class A Common Units        
Schedule of Investments [Line Items]        
Fair value     $ 4,500 4,499
Investment, Identifier [Axis]: Career Team Holdings, LLC, Common Stock        
Schedule of Investments [Line Items]        
Units (in shares) 450,000 450,000    
Cost $ 4,500 $ 4,500    
Fair value $ 4,500 $ 4,500    
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate     12.50%  
Fair value     $ 20,070 20,050
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate [14] 11.25%      
Reference Rate and Spread 6.00% [14] 6.00% [29],[30]    
Principal $ 450 [14] $ 0 [29],[30]    
Cost 442 [14] (9) [29],[30]    
Fair value $ 442 [14] $ (9) [29],[30]    
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 12.50% 12.50%    
Principal $ 20,250 $ 20,250    
Cost 20,110 20,090    
Fair value $ 20,110 $ 20,090    
Investment, Identifier [Axis]: CaseWorthy, Inc., Common Equity        
Schedule of Investments [Line Items]        
Units (in shares) 245,926 [5] 245,926 [6]    
Cost $ 246 [5] $ 246 [6]    
Fair value $ 246 [5] $ 246 [6]    
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 1        
Schedule of Investments [Line Items]        
Reference Rate and Spread 6.00% [5],[14],[17],[27] 6.00% [6],[29],[30]    
Principal $ 0 [5],[14],[17],[27] $ 0 [6],[29],[30]    
Cost (9) [5],[14],[17],[27] (11) [6],[29],[30]    
Fair value $ (9) [5],[14],[17],[27] $ (11) [6],[29],[30]    
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.54% [5],[14],[17] 10.73% [6],[29]    
Reference Rate and Spread 6.00% [5],[14],[17] 6.00% [6],[29]    
Principal $ 7,973 [5],[14],[17] $ 7,993 [6],[29]    
Cost 7,903 [5],[14],[17] 7,914 [6],[29]    
Fair value $ 7,973 [5],[14],[17] $ 7,914 [6],[29]    
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 11.54% [5],[14],[17] 10.48% [6],[29]    
Reference Rate and Spread 6.00% [5],[14],[17] 5.75% [6],[29]    
Principal $ 6,133 [5],[14],[17] $ 6,133 [6],[29]    
Cost 6,086 [5],[14],[17] 6,079 [6],[29]    
Fair value $ 6,133 [5],[14],[17] $ 6,133 [6],[29]    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 13,309 13,309    
Cost $ 6,122 $ 6,122    
Fair value $ 10,400 $ 8,700 $ 6,890 5,840
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate     12.00%  
Reference Rate and Spread     10.00%  
Fair value     $ 14,941 8,864
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Reference Rate and Spread 9.00% [14],[27] 9.00% [29],[30]    
Principal $ 0 [14],[27] $ 0 [29],[30]    
Cost 0 [14],[27] 0 [29],[30]    
Fair value $ 0 [14],[27] $ 0 [29],[30]    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 14.25% [14] 13.13% [29]    
Reference Rate and Spread 9.00% [14] 9.00% [29]    
Principal $ 15,030 [14] $ 15,030 [29]    
Cost 14,966 [14] 14,954 [29]    
Fair value $ 15,030 [14] $ 14,954 [29]    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 1        
Schedule of Investments [Line Items]        
Units (in shares) 4,347 [32] 4,347 [31]    
Cost $ 11,440 [32] $ 11,440 [31]    
Fair value $ 23,940 [32] $ 22,920 [31] 22,510 24,140
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units 2        
Schedule of Investments [Line Items]        
Units (in shares) 1,047,146 [32],[39] 1,047,146 [31],[40]    
Cost $ 1,773 [32],[39] $ 1,773 [31],[40]    
Fair value $ 2,830 [32],[39] $ 2,710 [31],[40] $ 1,540 1,540
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate     9.13%  
Reference Rate and Spread     8.00%  
Fair value     $ 17,466 17,817
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Reference Rate and Spread 6.00% [14],[17],[27] 6.00% [29],[30]    
Principal $ 0 [14],[17],[27] $ 0 [29],[30]    
Cost (77) [14],[17],[27] 0 [29],[30]    
Fair value $ 0 [14],[17],[27] $ 0 [29],[30]    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 13.36% [14],[17] 12.13% [29]    
Reference Rate and Spread 8.00% [14],[17] 8.00% [29]    
Principal $ 16,407 [14],[17] $ 16,945 [29]    
Cost 16,402 [14],[17] 16,935 [29]    
Fair value 16,407 [14],[17] $ 16,945 [29]    
Investment, Identifier [Axis]: Chandler Signs Holdings, LLC, Class A Units        
Schedule of Investments [Line Items]        
Units (in shares) [6]   1,500,000    
Cost [6]   $ 1,500    
Fair value $ 0 $ 1,790 [6] 620 460
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.51% [5],[14],[17],[46] 10.72% [6],[28],[29],[47]    
Reference Rate and Spread 6.25% [5],[14],[17],[46] 6.25% [6],[28],[29],[47]    
Principal $ 3,940 [5],[14],[17],[46] $ 1,868 [6],[28],[29],[47]    
Cost 3,851 [5],[14],[17],[46] 1,767 [6],[28],[29],[47]    
Fair value $ 3,877 [5],[14],[17],[46] $ 1,841 [6],[28],[29],[47]    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.39% [5],[14],[17],[46] 10.71% [6],[28],[29],[48]    
Reference Rate and Spread 6.25% [5],[14],[17],[46] 6.25% [6],[28],[29],[48]    
Principal $ 38,735 [5],[14],[17],[46] $ 39,047 [6],[28],[29],[48]    
Cost 38,166 [5],[14],[17],[46] 38,396 [6],[28],[29],[48]    
Fair value $ 38,121 [5],[14],[17],[46] $ 38,484 [6],[28],[29],[48]    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate [5],[14],[17] 11.39%      
Reference Rate and Spread [5],[14],[17] 6.25%      
Principal [5],[14],[17] $ 4,914      
Cost [5],[14],[17] 4,796      
Fair value [5],[14],[17] $ 4,836      
Investment, Identifier [Axis]: Charps, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 1,829 [32] 1,829 [31]    
Cost $ 1,963 [32] $ 1,963 [31]    
Fair value $ 13,800 [32] $ 13,340 [31] $ 13,450 13,990
Investment, Identifier [Axis]: Charps, LLC, Unsecured Debt        
Schedule of Investments [Line Items]        
Total Rate 10.00% 10.00% 10.00%  
Principal $ 5,694 $ 5,694    
Cost 4,661 4,643    
Fair value $ 5,694 $ 5,694 $ 5,694 5,694
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units 1        
Schedule of Investments [Line Items]        
Units (in shares) 717 [32] 717 [31]    
Cost $ 7,280 [32] $ 7,280 [31]    
Fair value $ 6,380 [32] $ 8,220 [31] 610 530
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units 2        
Schedule of Investments [Line Items]        
Units (in shares) 800 [39] 800 [40]    
Cost $ 509 [39] $ 210 [40]    
Fair value 1,129 [39] $ 610 [40] $ 10,250 10,250
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate     10.63%  
Reference Rate and Spread   9.00% [28],[29],[30] 9.50%  
Principal 0 [27] $ 0 [28],[29],[30]    
Cost 0 [27] 0 [28],[29],[30]    
Fair value $ 0 [27] $ 0 [28],[29],[30] $ 10,421 10,401
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 11.50% 13.23% [28],[29] 10.00%  
Reference Rate and Spread [28],[29]   9.00%    
Principal $ 9,720 $ 10,480 [28],[29]    
Cost 9,698 10,440 [28],[29]    
Fair value $ 9,634 $ 10,440 [28],[29] $ 1,055 1,071
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt 3        
Schedule of Investments [Line Items]        
Total Rate 10.00% 10.00%    
Principal $ 1,031 $ 1,049    
Cost 1,022 1,039    
Fair value $ 1,022 $ 1,039    
Investment, Identifier [Axis]: Clarius BIGS, LLC, Secured Debt        
Schedule of Investments [Line Items]        
Total Rate 15.00% [5],[15],[16] 15.00% [6],[33],[38]    
PIK Rate 15.00% [5],[15],[16] 15.00% [6],[33],[38]    
Principal $ 2,696 [5],[15],[16] $ 2,712 [6],[33],[38]    
Cost 2,696 [5],[15],[16] 2,712 [6],[33],[38]    
Fair value $ 22 [5],[15],[16] $ 19 [6],[33],[38]    
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Preferred Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 154 [32] 154 [31]    
Cost $ 5,760 [32] $ 5,760 [31]    
Fair value $ 18,230 [32] $ 24,637 [31] $ 23,790 15,260
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt 1        
Schedule of Investments [Line Items]        
Total Rate 11.25% [14] 9.75% [29] 7.00%  
Reference Rate and Spread 6.00% [14] 6.00% [29] 6.00%  
Principal $ 4,560 [14] $ 4,560 [29]    
Cost 4,560 [14] 4,560 [29]    
Fair value $ 4,560 [14] $ 4,560 [29] $ 5,560 4,000
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt 2        
Schedule of Investments [Line Items]        
Total Rate 8.00% 8.00% 8.00%  
Principal $ 19,274 $ 19,274    
Cost 19,203 19,182    
Fair value $ 19,274 $ 19,274 $ 19,274 19,274
Investment, Identifier [Axis]: Cody Pools, Inc., Preferred Member Units        
Schedule of Investments [Line Items]        
Units (in shares) 587 [32],[39] 587 [31],[40]    
Cost $ 8,317 [32],[39] $ 8,317 [31],[40]    
Fair value 65,120 [32],[39] $ 58,180 [31],[40] $ 51,190 47,640
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt        
Schedule of Investments [Line Items]        
Total Rate     12.25%  
Reference Rate and Spread     10.50%  
Fair value     $ 41,637 42,484