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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, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Fair Value $ 2,395,660 $ 2,488,715
Percentage of Total Net Assets 199.30% [1] 208.00% [2]
Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 1,187,331 $ 1,330,526
Jocassee Partners LLC | Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing    
Schedule of Investments [Line Items]    
Fair Value 1,168,585 1,315,630
Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 40,703 $ 79,599
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 $ 137,915 $ 132,498
Percentage of Total Net Assets 11.50% 11.10%
Aerospace and Defense | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 86,045 $ 82,200
Aerospace and Defense | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.80% 5.30%
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 7.30% 6.30%
Automotive    
Schedule of Investments [Line Items]    
Fair Value $ 47,832 $ 80,828
Percentage of Total Net Assets 4.00% 6.70%
Automotive | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 13,674 $ 26,087
Automotive | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 2,783 $ 2,463
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 3.30%
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.20% 2.00%
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 6.80% 3.10%
Banking, Finance, Insurance and Real Estate    
Schedule of Investments [Line Items]    
Fair Value $ 401,733 $ 401,816
Percentage of Total Net Assets 33.50% 33.60%
Banking, Finance, Insurance and Real Estate | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 119,636 $ 121,798
Banking, Finance, Insurance and Real Estate | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 254
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 16.80% 16.10%
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 10.20% 9.30%
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 0.00% 0.30%
Beverage, Food and Tobacco    
Schedule of Investments [Line Items]    
Fair Value $ 34,920 $ 23,135
Percentage of Total Net Assets 2.90% 1.90%
Beverage, Food and Tobacco | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 29,924 $ 30,637
Beverage, Food and Tobacco | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 3,556 $ 3,172
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% 0.90%
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 2.60% 2.30%
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 8.70% 4.00%
Capital Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 121,509 $ 128,706
Percentage of Total Net Assets 10.10% 10.80%
Capital Equipment | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 12,447 $ 17,986
Capital Equipment | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 5,271
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.10% 5.20%
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.10% 1.40%
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 6.60%
Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Fair Value $ 40,108 $ 35,897
Percentage of Total Net Assets 3.30% 3.00%
Chemicals, Plastics, and Rubber | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 38,055 $ 37,030
Chemicals, Plastics, and Rubber | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 2,989 $ 2,942
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.70% 1.50%
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 3.30% 2.80%
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 7.40% 3.70%
Construction and Building    
Schedule of Investments [Line Items]    
Fair Value $ 18,529 $ 30,387
Percentage of Total Net Assets 1.50% 2.50%
Construction and Building | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 17,542 $ 16,942
Construction and Building | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 1,867
Construction and Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.80% 1.20%
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 1.50% 1.30%
Construction and Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 2.40%
Consumer goods: Durable    
Schedule of Investments [Line Items]    
Fair Value $ 37,926 $ 47,074
Percentage of Total Net Assets 3.20% 3.90%
Consumer goods: Durable | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 24,713 $ 26,412
Consumer goods: Durable | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 1,087 $ 1,042
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.60% 1.90%
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 2.10% 2.00%
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.70% 1.30%
Consumer goods: Non-durable    
Schedule of Investments [Line Items]    
Fair Value $ 41,064 $ 28,210
Percentage of Total Net Assets 3.40% 2.40%
Consumer goods: Non-durable | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 22,689 $ 21,850
Consumer goods: Non-durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.70% 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 1.90% 1.70%
Containers, Packaging and Glass    
Schedule of Investments [Line Items]    
Fair Value $ 36,762 $ 37,524
Percentage of Total Net Assets 3.10% 3.10%
Containers, Packaging and Glass | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 28,863 $ 26,829
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 2.50% 2.00%
Electrical Components & Equipment    
Schedule of Investments [Line Items]    
Fair Value $ 10,440 $ 0
Percentage of Total Net Assets 0.90% 0.00%
Electrical Components & Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.40% 0.00%
Energy: Electricity    
Schedule of Investments [Line Items]    
Fair Value $ 28,856 $ 20,874
Percentage of Total Net Assets 2.40% 1.70%
Energy: Electricity | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 22,940 $ 20,250
Energy: Electricity | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.20% 0.80%
Energy: Electricity | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 1.50%
Energy: Oil and Gas    
Schedule of Investments [Line Items]    
Fair Value $ 3,113 $ 3,240
Percentage of Total Net Assets 0.30% 0.30%
Energy: Oil and Gas | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 9,281 $ 6,724
Energy: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.10% 0.10%
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 0.80% 0.50%
Environmental Services    
Schedule of Investments [Line Items]    
Fair Value $ 51,846 $ 53,484
Percentage of Total Net Assets 4.30% 4.50%
Environmental Services | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 3,487
Environmental Services | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.10% 2.10%
Environmental Services | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 4.40%
Environmental Industries    
Schedule of Investments [Line Items]    
Fair Value   $ 53,484
Percentage of Total Net Assets   4.50%
Environmental Industries | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 6,335 $ 6,986
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio   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 0.50% 0.50%
Forest Products & Paper | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 3,113 $ 3,605
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 0.30% 0.30%
Healthcare & Pharmaceuticals    
Schedule of Investments [Line Items]    
Fair Value $ 186,845 $ 216,952
Percentage of Total Net Assets 15.50% 18.10%
Healthcare & Pharmaceuticals | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 118,175 $ 141,070
Healthcare & Pharmaceuticals | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 3,784 $ 12,880
Healthcare & Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 7.80% 8.70%
Healthcare & Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 10.10% 10.70%
Healthcare & Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 9.30% 16.20%
High Tech Industries    
Schedule of Investments [Line Items]    
Fair Value $ 254,135 $ 303,082
Percentage of Total Net Assets 21.10% 25.40%
High Tech Industries | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 119,603 $ 174,572
High Tech Industries | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 9,319 $ 14,661
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 10.60% 12.20%
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 10.20% 13.30%
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 22.90% 18.40%
Hotel, Gaming and Leisure    
Schedule of Investments [Line Items]    
Fair Value $ 56,582 $ 54,256
Percentage of Total Net Assets 4.70% 4.50%
Hotel, Gaming and Leisure | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 21,004 $ 22,834
Hotel, Gaming and Leisure | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.30% 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 1.80% 1.70%
Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Fair Value $ 105,494 $ 110,066
Percentage of Total Net Assets 8.80% 9.20%
Investment Funds and Vehicles | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 25,567 $ 33,450
Investment Funds and Vehicles | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.40% 4.40%
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 2.20% 2.50%
Media: Advertising, Printing and Publishing    
Schedule of Investments [Line Items]    
Fair Value $ 42,354 $ 39,447
Percentage of Total Net Assets 3.50% 3.30%
Media: Advertising, Printing and Publishing | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 12,093 $ 12,081
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.80% 1.60%
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% 0.90%
Media: Broadcasting and Subscription    
Schedule of Investments [Line Items]    
Fair Value $ 12,359 $ 13,277
Percentage of Total Net Assets 1.00% 1.10%
Media: Broadcasting and Subscription | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 20,042 $ 31,201
Media: Broadcasting and Subscription | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.50% 0.50%
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 1.70% 2.40%
Media: Diversified and Production    
Schedule of Investments [Line Items]    
Fair Value $ 66,944 $ 64,559
Percentage of Total Net Assets 5.60% 5.40%
Media: Diversified and Production | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 34,481 $ 34,391
Media: Diversified and Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.80% 2.60%
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 3.00% 2.60%
Metals and Mining    
Schedule of Investments [Line Items]    
Fair Value $ 8,788 $ 8,993
Percentage of Total Net Assets 0.70% 0.80%
Metals and Mining | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 4,775 $ 3,863
Metals and Mining | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.40% 0.40%
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 0.40% 0.30%
Retail | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 11,390 $ 13,141
Retail | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 6,233 $ 6,255
Retail | 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%
Retail | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 15.30% 7.90%
Services: Business    
Schedule of Investments [Line Items]    
Fair Value $ 363,373 $ 326,762
Percentage of Total Net Assets 30.20% 27.30%
Services: Business | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 211,291 $ 222,610
Services: Business | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 4,650 $ 6,798
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 15.20% 13.20%
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 18.10% 16.90%
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 11.40% 8.50%
Services: Consumer    
Schedule of Investments [Line Items]    
Fair Value $ 59,146 $ 61,409
Percentage of Total Net Assets 4.90% 5.10%
Services: Consumer | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 59,951 $ 58,632
Services: Consumer | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 8,525
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.50% 2.50%
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.00% 4.50%
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 10.70%
Structured products    
Schedule of Investments [Line Items]    
Fair Value $ 101,231 $ 102,922
Percentage of Total Net Assets 8.40% 8.60%
Structured products | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.20% 4.10%
Telecommunications    
Schedule of Investments [Line Items]    
Fair Value $ 28,119 $ 27,565
Percentage of Total Net Assets 2.30% 2.30%
Telecommunications | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 36,200 $ 36,027
Telecommunications | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.20% 1.10%
Telecommunications | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.10% 2.70%
Transportation: Cargo    
Schedule of Investments [Line Items]    
Fair Value $ 82,385 $ 96,450
Percentage of Total Net Assets 6.90% 8.10%
Transportation: Cargo | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 46,309 $ 57,575
Transportation: Cargo | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 6,302 $ 6,296
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.40% 3.90%
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 4.40%
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 15.50% 7.90%
Transportation: Consumer    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 11,951
Percentage of Total Net Assets 0.00% 1.00%
Transportation: Consumer | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 5,451 $ 12,613
Transportation: Consumer | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 3,686
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 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 0.50% 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 0.00% 4.60%
Utilities: Electric    
Schedule of Investments [Line Items]    
Fair Value $ 15,352 $ 22,696
Percentage of Total Net Assets 1.30% 1.90%
Utilities: Electric | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 6,996 $ 9,396
Utilities: Electric | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.60% 0.90%
Utilities: Electric | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.60% 0.70%
Utilities: Oil and Gas    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 4,655
Percentage of Total Net Assets 0.00% 0.40%
Utilities: Oil and Gas | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 6,838
Utilities: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 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 0.00% 0.50%
[1] Fair value as a percentage of net assets.
[2] Fair value as a percentage of net assets.