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INVESTMENTS - Industry Composition (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Fair Value $ 2,556,114 $ 2,448,935
Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 106,251 110,047
Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 1,212,132 $ 1,209,063
Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Aerospace and Defense    
Schedule of Investments [Line Items]    
Fair Value $ 143,668 $ 120,945
Aerospace and Defense | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 71,892 $ 69,133
Aerospace and Defense | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.60% 4.90%
Aerospace and Defense | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.90% 5.70%
Automotive    
Schedule of Investments [Line Items]    
Fair Value $ 80,731 $ 76,934
Automotive | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 2,386 2,283
Automotive | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 21,930 $ 20,625
Automotive | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.20% 3.20%
Automotive | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.20% 2.10%
Automotive | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.80% 1.70%
Banking, Finance, Insurance and Real Estate    
Schedule of Investments [Line Items]    
Fair Value $ 358,053 $ 312,936
Banking, Finance, Insurance and Real Estate | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 1,016 1,414
Banking, Finance, Insurance and Real Estate | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 106,880 $ 105,047
Banking, Finance, Insurance and Real Estate | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 14.00% 12.80%
Banking, Finance, Insurance and Real Estate | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.30%
Banking, Finance, Insurance and Real Estate | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 8.80% 8.70%
Beverage, Food and Tobacco    
Schedule of Investments [Line Items]    
Fair Value $ 36,133 $ 34,690
Beverage, Food and Tobacco | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 3,132 3,181
Beverage, Food and Tobacco | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 28,321 $ 25,885
Beverage, Food and Tobacco | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.40% 1.40%
Beverage, Food and Tobacco | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.90% 2.90%
Beverage, Food and Tobacco | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.30% 2.10%
Capital Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 145,705 $ 141,479
Capital Equipment | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 9,226 9,208
Capital Equipment | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 25,438 $ 25,014
Capital Equipment | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.70% 5.80%
Capital Equipment | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 8.70% 8.40%
Capital Equipment | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.10% 2.10%
Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Fair Value $ 46,877 $ 47,076
Chemicals, Plastics, and Rubber | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 2,751 2,772
Chemicals, Plastics, and Rubber | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 31,774 $ 33,111
Chemicals, Plastics, and Rubber | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.80% 1.90%
Chemicals, Plastics, and Rubber | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.60% 2.50%
Chemicals, Plastics, and Rubber | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.60% 2.70%
Construction and Building    
Schedule of Investments [Line Items]    
Fair Value $ 44,105 $ 45,049
Construction and Building | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 1,882 1,887
Construction and Building | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 17,363 $ 17,616
Construction and Building | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.70% 1.80%
Construction and Building | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.80% 1.70%
Construction and Building | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.40% 1.50%
Consumer goods: Durable    
Schedule of Investments [Line Items]    
Fair Value $ 43,165 $ 43,932
Consumer goods: Durable | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 750 1,272
Consumer goods: Durable | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 18,441 $ 18,751
Consumer goods: Durable | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.70% 1.80%
Consumer goods: Durable | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.70% 1.10%
Consumer goods: Durable | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.50% 1.70%
Consumer goods: Non-durable    
Schedule of Investments [Line Items]    
Fair Value $ 27,817 $ 27,693
Consumer goods: Non-durable | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 24,468 $ 22,861
Consumer goods: Non-durable | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.10% 1.10%
Consumer goods: Non-durable | 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 $ 38,312 $ 37,877
Containers, Packaging and Glass | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 1,807 1,812
Containers, Packaging and Glass | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 21,468 $ 24,445
Containers, Packaging and Glass | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.50% 1.50%
Containers, Packaging and Glass | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.70% 1.60%
Containers, Packaging and Glass | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.80% 2.00%
Energy: Electricity    
Schedule of Investments [Line Items]    
Fair Value $ 7,718 $ 7,337
Energy: Electricity | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 15,273 $ 15,375
Energy: Electricity | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.30% 0.30%
Energy: Electricity | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.30% 1.30%
Energy: Oil and Gas    
Schedule of Investments [Line Items]    
Fair Value $ 4,497 $ 4,776
Energy: Oil and Gas | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 5,493 $ 5,726
Energy: Oil and Gas | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.20% 0.20%
Energy: Oil and Gas | 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 $ 51,319 $ 51,006
Environmental Industries | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 7,950 7,797
Environmental Industries | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 7,335 $ 7,314
Environmental Industries | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.10%
Environmental Industries | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 7.50% 7.10%
Environmental Industries | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.60% 0.60%
Forest Products & Paper | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 2,802 $ 2,269
Forest Products & Paper | 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 $ 195,826 $ 203,576
Healthcare and Pharmaceuticals | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 13,856 13,614
Healthcare and Pharmaceuticals | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 132,192 $ 128,983
Healthcare and Pharmaceuticals | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 7.70% 8.30%
Healthcare and Pharmaceuticals | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 13.00% 12.40%
Healthcare and Pharmaceuticals | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 10.90% 10.70%
High Tech Industries    
Schedule of Investments [Line Items]    
Fair Value $ 314,514 $ 300,980
High Tech Industries | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 14,226 13,713
High Tech Industries | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 141,309 $ 141,906
High Tech Industries | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 12.30% 12.30%
High Tech Industries | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 13.40% 12.50%
High Tech Industries | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 11.70% 11.70%
Hotel, Gaming and Leisure    
Schedule of Investments [Line Items]    
Fair Value $ 54,326 $ 54,023
Hotel, Gaming and Leisure | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 27,733 $ 23,587
Hotel, Gaming and Leisure | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.10% 2.20%
Hotel, Gaming and Leisure | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.30% 2.00%
Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Fair Value $ 123,508 $ 130,427
Investment Funds and Vehicles | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 48,651 $ 61,028
Investment Funds and Vehicles | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.80% 5.30%
Investment Funds and Vehicles | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 5.00%
Media: Advertising, Printing and Publishing    
Schedule of Investments [Line Items]    
Fair Value $ 55,057 $ 55,477
Media: Advertising, Printing and Publishing | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 9,975 10,032
Media: Advertising, Printing and Publishing | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 5,982 $ 5,969
Media: Advertising, Printing and Publishing | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.20% 2.30%
Media: Advertising, Printing and Publishing | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 9.40% 9.10%
Media: Advertising, Printing and Publishing | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.50% 0.50%
Media: Broadcasting and Subscription    
Schedule of Investments [Line Items]    
Fair Value $ 20,249 $ 20,257
Media: Broadcasting and Subscription | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 33,800 $ 34,676
Media: Broadcasting and Subscription | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.80% 0.80%
Media: Broadcasting and Subscription | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.80% 2.90%
Media: Diversified and Production    
Schedule of Investments [Line Items]    
Fair Value $ 62,423 $ 60,561
Media: Diversified and Production | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 5,596 5,498
Media: Diversified and Production | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 29,830 $ 28,897
Media: Diversified and Production | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.40% 2.50%
Media: Diversified and Production | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.30% 5.00%
Media: Diversified and Production | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.50% 2.40%
Metals and Mining    
Schedule of Investments [Line Items]    
Fair Value $ 32,472 $ 33,125
Metals and Mining | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 3,910 $ 5,069
Metals and Mining | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.30% 1.40%
Metals and Mining | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.30% 0.40%
Retail | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 5,746 $ 5,489
Retail | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 16,306 $ 15,720
Retail | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.40% 5.00%
Retail | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.30% 1.30%
Services: Business    
Schedule of Investments [Line Items]    
Fair Value $ 359,253 $ 338,417
Services: Business | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 6,746 10,876
Services: Business | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 199,721 $ 199,805
Services: Business | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 14.10% 13.80%
Services: Business | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 6.40% 9.90%
Services: Business | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 16.50% 16.50%
Services: Consumer    
Schedule of Investments [Line Items]    
Fair Value $ 59,465 $ 67,070
Services: Consumer | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 8,396 8,265
Services: Consumer | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 52,961 $ 52,543
Services: Consumer | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.30% 2.70%
Services: Consumer | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 7.90% 7.50%
Services: Consumer | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.40% 4.30%
Structured products    
Schedule of Investments [Line Items]    
Fair Value $ 92,310 $ 86,703
Structured products | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.60% 3.50%
Telecommunications    
Schedule of Investments [Line Items]    
Fair Value $ 24,930 $ 24,058
Telecommunications | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 38,384 $ 38,034
Telecommunications | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.00%
Telecommunications | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.20% 3.10%
Transportation: Cargo    
Schedule of Investments [Line Items]    
Fair Value $ 100,756 $ 89,398
Transportation: Cargo | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 6,319 6,221
Transportation: Cargo | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 56,704 $ 56,018
Transportation: Cargo | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.90% 3.70%
Transportation: Cargo | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.90% 5.60%
Transportation: Cargo | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.70% 4.60%
Transportation: Consumer    
Schedule of Investments [Line Items]    
Fair Value $ 11,125 $ 11,062
Transportation: Consumer | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value 4,491 4,713
Transportation: Consumer | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 12,739 $ 12,562
Transportation: Consumer | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.40% 0.50%
Transportation: Consumer | Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.20% 4.30%
Transportation: Consumer | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.00%
Utilities: Electric    
Schedule of Investments [Line Items]    
Fair Value $ 17,113 $ 17,374
Utilities: Electric | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 6,147 $ 4,194
Utilities: Electric | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.70% 0.70%
Utilities: Electric | 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 $ 4,687 $ 4,697
Utilities: Oil and Gas | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 6,885 $ 6,900
Utilities: Oil and Gas | Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.20% 0.20%
Utilities: Oil and Gas | Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.60% 0.60%