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INVESTMENTS - Industry Composition (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]    
Fair value of investment owned $ 2,332,492 [1] $ 1,800,594 [2]
Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 1,213,233 $ 1,245,647
Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 115,670  
Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00%  
Aerospace and Defense    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 110,440 $ 91,129
Aerospace and Defense | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 68,990 $ 71,857
Aerospace and Defense | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.70% 5.10%
Aerospace and Defense | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.70% 5.80%
Automotive    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 65,696 $ 55,875
Automotive | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 20,022 $ 18,626
Automotive | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 2,362  
Automotive | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.80% 3.10%
Automotive | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.70% 1.50%
Automotive | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.10%  
Banking, Finance, Insurance and Real Estate    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 257,752 $ 208,397
Banking, Finance, Insurance and Real Estate | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 100,624 $ 109,961
Banking, Finance, Insurance and Real Estate | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 1,541  
Banking, Finance, Insurance and Real Estate | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 11.10% 11.60%
Banking, Finance, Insurance and Real Estate | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 8.30% 8.80%
Banking, Finance, Insurance and Real Estate | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.30%  
Beverage, Food and Tobacco    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 34,768 $ 38,985
Beverage, Food and Tobacco | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 26,115 $ 30,352
Beverage, Food and Tobacco | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 4,069  
Beverage, Food and Tobacco | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.50% 2.20%
Beverage, Food and Tobacco | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.20% 2.40%
Beverage, Food and Tobacco | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.50%  
Capital Equipment    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 50,613 $ 42,916
Capital Equipment | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 26,421 $ 17,006
Capital Equipment | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 9,231  
Capital Equipment | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.20% 2.40%
Capital Equipment | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.20% 1.40%
Capital Equipment | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 8.00%  
Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 85,121 $ 32,234
Chemicals, Plastics, and Rubber | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 31,236 $ 24,665
Chemicals, Plastics, and Rubber | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 2,832  
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.60% 1.80%
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.60% 2.00%
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.40%  
Construction and Building    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 40,733 $ 62,083
Construction and Building | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 15,700 $ 14,506
Construction and Building | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 1,892  
Construction and Building | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.70% 3.40%
Construction and Building | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.30% 1.20%
Construction and Building | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.60%  
Consumer goods: Durable    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 54,859 $ 47,316
Consumer goods: Durable | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 18,181 $ 10,294
Consumer goods: Durable | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 1,365  
Consumer goods: Durable | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.40% 2.60%
Consumer goods: Durable | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.50% 0.80%
Consumer goods: Durable | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.20%  
Consumer goods: Non-durable    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 26,196 $ 28,306
Consumer goods: Non-durable | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 21,548 $ 23,886
Consumer goods: Non-durable | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.10% 1.60%
Consumer goods: Non-durable | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.80% 1.90%
Containers, Packaging and Glass    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 37,425 $ 10,218
Containers, Packaging and Glass | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 22,968 $ 25,277
Containers, Packaging and Glass | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 1,817  
Containers, Packaging and Glass | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.60% 0.60%
Containers, Packaging and Glass | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.90% 2.00%
Containers, Packaging and Glass | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.60%  
Energy: Electricity    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 7,241 $ 12,190
Energy: Electricity | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 15,239 $ 10,571
Energy: Electricity | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.30% 0.70%
Energy: Electricity | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.30% 0.80%
Energy: Oil and Gas    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 4,561 $ 5,774
Energy: Oil and Gas | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 4,689 $ 5,091
Energy: Oil and Gas | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.20% 0.30%
Energy: Oil and Gas | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.40% 0.40%
Environmental Industries    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 50,137 $ 8,081
Environmental Industries | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 7,244 $ 7,563
Environmental Industries | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 8,417  
Environmental Industries | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.10% 0.40%
Environmental Industries | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.60% 0.60%
Environmental Industries | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 7.30%  
Healthcare and Pharmaceuticals    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 169,542 $ 134,286
Healthcare and Pharmaceuticals | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 125,941 $ 128,495
Healthcare and Pharmaceuticals | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 14,272  
Healthcare and Pharmaceuticals | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 7.30% 7.50%
Healthcare and Pharmaceuticals | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 10.40% 10.30%
Healthcare and Pharmaceuticals | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 12.30%  
High Tech Industries    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 309,080 $ 139,590
High Tech Industries | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 158,946 $ 171,960
High Tech Industries | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 13,825  
High Tech Industries | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 13.30% 7.70%
High Tech Industries | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 13.10% 13.80%
High Tech Industries | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 12.00%  
Hotel, Gaming and Leisure    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 49,799 $ 27,553
Hotel, Gaming and Leisure | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 22,734 $ 35,383
Hotel, Gaming and Leisure | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.10% 1.50%
Hotel, Gaming and Leisure | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.90% 2.80%
Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 149,761 $ 143,104
Investment Funds and Vehicles | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 80,201 $ 127,092
Investment Funds and Vehicles | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 6.40% 7.90%
Investment Funds and Vehicles | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 6.60% 10.20%
Media: Advertising, Printing and Publishing    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 54,147 $ 46,414
Media: Advertising, Printing and Publishing | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 6,096 $ 18,423
Media: Advertising, Printing and Publishing | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 10,038  
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.30% 2.60%
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.50% 1.50%
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 8.70%  
Media: Broadcasting and Subscription    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 8,317 $ 7,441
Media: Broadcasting and Subscription | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 34,000 $ 37,840
Media: Broadcasting and Subscription | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.40% 0.40%
Media: Broadcasting and Subscription | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.80% 3.00%
Media: Diversified and Production    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 64,810 $ 52,887
Media: Diversified and Production | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 27,720 $ 21,059
Media: Diversified and Production | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 5,407  
Media: Diversified and Production | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.80% 2.90%
Media: Diversified and Production | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.30% 1.70%
Media: Diversified and Production | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.70%  
Metals and Mining    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 34,003 $ 10,684
Metals and Mining | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 5,054 $ 5,792
Metals and Mining | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.50% 0.60%
Metals and Mining | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.40% 0.50%
Retail    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 42 $ 0
Retail | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 14,222 $ 14,420
Retail | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 5,647  
Retail | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Retail | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.20% 1.20%
Retail | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.90%  
Services: Business    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 381,362 $ 342,758
Services: Business | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 192,727 $ 151,723
Services: Business | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 11,768  
Services: Business | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 16.40% 19.00%
Services: Business | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 15.90% 12.20%
Services: Business | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 10.20%  
Services: Consumer    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 78,465 $ 65,801
Services: Consumer | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 50,535 $ 55,156
Services: Consumer | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 8,361  
Services: Consumer | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.40% 3.70%
Services: Consumer | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.10% 4.40%
Services: Consumer | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 7.20%  
Structured products    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 62,603 $ 24,662
Structured products | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 0 $ 5,409
Structured products | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.70% 1.40%
Structured products | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.40%
Telecommunications    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 23,829 $ 45,182
Telecommunications | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 38,311 $ 36,036
Telecommunications | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 2.50%
Telecommunications | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.10% 2.90%
Transportation: Cargo    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 73,174 $ 86,964
Transportation: Cargo | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 54,903 $ 49,103
Transportation: Cargo | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 6,181  
Transportation: Cargo | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.10% 4.80%
Transportation: Cargo | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.50% 3.90%
Transportation: Cargo | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.30%  
Transportation: Consumer    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 25,393 $ 12,231
Transportation: Consumer | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned 12,499 $ 6,546
Transportation: Consumer | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 4,855  
Transportation: Consumer | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.10% 0.70%
Transportation: Consumer | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 0.50%
Transportation: Consumer | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.20%  
Utilities: Electric    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 17,291 $ 12,857
Utilities: Electric | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 3,181 $ 3,265
Utilities: Electric | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.70% 0.70%
Utilities: Electric | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.20% 0.30%
Utilities: Oil and Gas    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 4,707 $ 4,677
Utilities: Oil and Gas | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 6,915 $ 6,870
Utilities: Oil and Gas | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.20% 0.30%
Utilities: Oil and Gas | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.50% 0.60%
Wholesale    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 625 $ 0
Wholesale | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 0 $ 945
Wholesale | Percentage of Total Portfolio | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Wholesale | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.10%
Forest Products & Paper | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 271 $ 475
Forest Products & Paper | Sierra JV    
Schedule of Investments [Line Items]    
Fair value of investment owned $ 1,790  
Forest Products & Paper | Percentage of Total Portfolio | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Forest Products & Paper | Percentage of Total Portfolio | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.50%  
[1] Some or all of the investment is or will be encumbered as security for the Company's $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the "February 2019 Credit Facility").
[2] Some or all of the investment is or will be encumbered as security for the Company's senior secured credit facility with ING Capital LLC.