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INVESTMENTS - Schedule of Industry Composition of Investment at Fair Value (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 2,505,992 | [1] | $ 2,448,935 | [2]
Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 1,246,150 |  | 1,209,063 |
Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 106,927 |  | $ 110,047 |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 100.00% |  | 100.00% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 100.00% |  | 100.00% |
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 100.00% |  | 100.00% |
Aerospace and Defense |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 138,050 |  | $ 120,945 |
Aerospace and Defense | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 76,238 |  | $ 69,133 |
Aerospace and Defense | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 5.50% |  | 4.90% |
Aerospace and Defense | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 6.10% |  | 5.70% |
Automotive |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 87,101 |  | $ 76,934 |
Automotive | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 22,154 |  | 20,625 |
Automotive | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 2,517 |  | $ 2,283 |
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 3.50% |  | 3.20% |
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.80% |  | 1.70% |
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.30% |  | 2.10% |
Banking, Finance, Insurance and Real Estate |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 377,001 |  | $ 312,936 |
Banking, Finance, Insurance and Real Estate | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 107,781 |  | 105,047 |
Banking, Finance, Insurance and Real Estate | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 1,040 |  | $ 1,414 |
Banking, Finance, Insurance and Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 15.00% |  | 12.80% |
Banking, Finance, Insurance and Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 8.60% |  | 8.70% |
Banking, Finance, Insurance and Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.00% |  | 1.30% |
Beverage, Food and Tobacco |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 37,055 |  | $ 34,690 |
Beverage, Food and Tobacco | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 31,472 |  | 25,885 |
Beverage, Food and Tobacco | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 3,307 |  | $ 3,181 |
Beverage, Food and Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.50% |  | 1.40% |
Beverage, Food and Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.50% |  | 2.10% |
Beverage, Food and Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 3.10% |  | 2.90% |
Capital Equipment |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 139,473 |  | $ 141,479 |
Capital Equipment | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 26,164 |  | 25,014 |
Capital Equipment | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 9,273 |  | $ 9,208 |
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 5.60% |  | 5.80% |
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.10% |  | 2.10% |
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 8.70% |  | 8.40% |
Chemicals, Plastics, and Rubber |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 37,204 |  | $ 47,076 |
Chemicals, Plastics, and Rubber | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 32,268 |  | 33,111 |
Chemicals, Plastics, and Rubber | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 2,684 |  | $ 2,772 |
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.50% |  | 1.90% |
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.60% |  | 2.70% |
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.50% |  | 2.50% |
Construction and Building |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 29,948 |  | $ 45,049 |
Construction and Building | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 16,456 |  | 17,616 |
Construction and Building | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 1,877 |  | $ 1,887 |
Construction and Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.20% |  | 1.80% |
Construction and Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.30% |  | 1.50% |
Construction and Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.80% |  | 1.70% |
Consumer goods: Durable |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 44,254 |  | $ 43,932 |
Consumer goods: Durable | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 19,304 |  | 18,751 |
Consumer goods: Durable | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 988 |  | $ 1,272 |
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.80% |  | 1.80% |
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.60% |  | 1.70% |
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.90% |  | 1.10% |
Consumer goods: Non-durable |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 27,513 |  | $ 27,693 |
Consumer goods: Non-durable | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 24,320 |  | $ 22,861 |
Consumer goods: Non-durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.10% |  | 1.10% |
Consumer goods: Non-durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.00% |  | 1.90% |
Containers, Packaging and Glass |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 37,913 |  | $ 37,877 |
Containers, Packaging and Glass | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 25,959 |  | 24,445 |
Containers, Packaging and Glass | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 1,803 |  | $ 1,812 |
Containers, Packaging and Glass | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.50% |  | 1.50% |
Containers, Packaging and Glass | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.10% |  | 2.00% |
Containers, Packaging and Glass | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.70% |  | 1.60% |
Energy: Electricity |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 7,836 |  | $ 7,337 |
Energy: Electricity | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 15,458 |  | $ 15,375 |
Energy: Electricity | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.30% |  | 0.30% |
Energy: Electricity | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.20% |  | 1.30% |
Energy: Oil and Gas |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 4,533 |  | $ 4,776 |
Energy: Oil and Gas | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 6,379 |  | $ 5,726 |
Energy: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.20% |  | 0.20% |
Energy: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.50% |  | 0.50% |
Environmental Industries |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 51,386 |  | $ 51,006 |
Environmental Industries | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 7,015 |  | 7,314 |
Environmental Industries | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 8,062 |  | $ 7,797 |
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.10% |  | 2.10% |
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.60% |  | 0.60% |
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 7.50% |  | 7.10% |
Forest Products & Paper | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 2,951 |  | $ 2,269 |
Forest Products & Paper | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.20% |  | 0.20% |
Healthcare and Pharmaceuticals |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 193,058 |  | $ 203,576 |
Healthcare and Pharmaceuticals | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 140,680 |  | 128,983 |
Healthcare and Pharmaceuticals | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 13,301 |  | $ 13,614 |
Healthcare and Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 7.70% |  | 8.30% |
Healthcare and Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 11.30% |  | 10.70% |
Healthcare and Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 12.40% |  | 12.40% |
High Tech Industries |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 286,196 |  | $ 300,980 |
High Tech Industries | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 151,718 |  | 141,906 |
High Tech Industries | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 14,684 |  | $ 13,713 |
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 11.40% |  | 12.30% |
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 12.20% |  | 11.70% |
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 13.70% |  | 12.50% |
Hotel, Gaming and Leisure |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 54,856 |  | $ 54,023 |
Hotel, Gaming and Leisure | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 29,274 |  | $ 23,587 |
Hotel, Gaming and Leisure | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.20% |  | 2.20% |
Hotel, Gaming and Leisure | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.40% |  | 2.00% |
Investment Funds and Vehicles |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 119,607 |  | $ 130,427 |
Investment Funds and Vehicles | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 40,834 |  | $ 61,028 |
Investment Funds and Vehicles | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 4.80% |  | 5.30% |
Investment Funds and Vehicles | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 3.30% |  | 5.00% |
Media: Advertising, Printing and Publishing |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 49,235 |  | $ 55,477 |
Media: Advertising, Printing and Publishing | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 11,907 |  | 5,969 |
Media: Advertising, Printing and Publishing | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 9,918 |  | $ 10,032 |
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.90% |  | 2.30% |
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.00% |  | 0.50% |
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 9.30% |  | 9.10% |
Media: Broadcasting and Subscription |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 20,540 |  | $ 20,257 |
Media: Broadcasting and Subscription | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 31,533 |  | $ 34,676 |
Media: Broadcasting and Subscription | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.80% |  | 0.80% |
Media: Broadcasting and Subscription | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.50% |  | 2.90% |
Media: Diversified and Production |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 62,466 |  | $ 60,561 |
Media: Diversified and Production | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 28,556 |  | 28,897 |
Media: Diversified and Production | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 5,626 |  | $ 5,498 |
Media: Diversified and Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.50% |  | 2.50% |
Media: Diversified and Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.30% |  | 2.40% |
Media: Diversified and Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 5.30% |  | 5.00% |
Metals and Mining |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 32,042 |  | $ 33,125 |
Metals and Mining | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 3,903 |  | $ 5,069 |
Metals and Mining | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.30% |  | 1.40% |
Metals and Mining | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.30% |  | 0.40% |
Retail | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 14,125 |  | $ 15,720 |
Retail | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 6,055 |  | $ 5,489 |
Retail | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.10% |  | 1.30% |
Retail | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 5.70% |  | 5.00% |
Services: Business |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 356,439 |  | $ 338,417 |
Services: Business | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 204,382 |  | 199,805 |
Services: Business | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 6,867 |  | $ 10,876 |
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 14.20% |  | 13.80% |
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 16.40% |  | 16.50% |
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 6.40% |  | 9.90% |
Services: Consumer |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 63,407 |  | $ 67,070 |
Services: Consumer | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 53,562 |  | 52,543 |
Services: Consumer | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 8,382 |  | $ 8,265 |
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 2.50% |  | 2.70% |
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 4.30% |  | 4.30% |
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 7.80% |  | 7.50% |
Structured products |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 91,969 |  | $ 86,703 |
Structured products | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 3.70% |  | 3.50% |
Telecommunications |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 26,462 |  | $ 24,058 |
Telecommunications | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 37,267 |  | $ 38,034 |
Telecommunications | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.00% |  | 1.00% |
Telecommunications | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 3.00% |  | 3.10% |
Transportation: Cargo |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 97,311 |  | $ 89,398 |
Transportation: Cargo | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 58,710 |  | 56,018 |
Transportation: Cargo | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 6,311 |  | $ 6,221 |
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 3.90% |  | 3.70% |
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 4.70% |  | 4.60% |
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 5.90% |  | 5.60% |
Transportation: Consumer |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 11,289 |  | $ 11,062 |
Transportation: Consumer | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | 12,749 |  | 12,562 |
Transportation: Consumer | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 4,232 |  | $ 4,713 |
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.40% |  | 0.50% |
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 1.00% |  | 1.00% |
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 4.00% |  | 4.30% |
Utilities: Electric |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 17,172 |  | $ 17,374 |
Utilities: Electric | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 6,161 |  | $ 4,194 |
Utilities: Electric | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.70% |  | 0.70% |
Utilities: Electric | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.50% |  | 0.30% |
Utilities: Oil and Gas |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 4,676 |  | $ 4,697 |
Utilities: Oil and Gas | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Fair Value | $ 6,870 |  | $ 6,900 |
Utilities: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.20% |  | 0.20% |
Utilities: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percentage of Total Portfolio | 0.50% |  | 0.60% |
[1] | 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] | 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 the February 2019 Credit Facility.

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