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Investments - Industry Composition (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 2,488,715 | [1] | $ 2,448,935
Percent of Total Net Assets | 208.00% | [1] | 205.40%
Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 1,315,630 |  | $ 1,209,063
Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 79,599 |  | $ 110,047
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 100.00% |  | 100.00%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 100.00% |  | 100.00%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 100.00% |  | 100.00%
Aerospace and Defense |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 132,498 |  | $ 120,945
Percent of Total Net Assets | 11.10% |  | 10.10%
Aerospace and Defense | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 82,200 |  | $ 69,133
Aerospace and Defense | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 5.30% |  | 4.90%
Aerospace and Defense | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 6.30% |  | 5.70%
Automotive |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 80,828 |  | $ 76,934
Percent of Total Net Assets | 6.70% |  | 6.50%
Automotive | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 26,087 |  | $ 20,625
Automotive | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 2,463 |  | $ 2,283
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 3.30% |  | 3.20%
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.00% |  | 1.70%
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 3.10% |  | 2.10%
Banking, Finance, Insurance and Real Estate |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 401,816 |  | $ 312,936
Percent of Total Net Assets | 33.60% |  | 26.20%
Banking, Finance, Insurance and Real Estate | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 121,798 |  | $ 105,047
Banking, Finance, Insurance and Real Estate | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 254 |  | $ 1,414
Banking, Finance, Insurance and Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 16.10% |  | 12.80%
Banking, Finance, Insurance and Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 9.30% |  | 8.70%
Banking, Finance, Insurance and Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.30% |  | 1.30%
Beverage, Food and Tobacco |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 23,135 |  | $ 34,690
Percent of Total Net Assets | 1.90% |  | 2.90%
Beverage, Food and Tobacco | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 30,637 |  | $ 25,885
Beverage, Food and Tobacco | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 3,172 |  | $ 3,181
Beverage, Food and Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.90% |  | 1.40%
Beverage, Food and Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.30% |  | 2.10%
Beverage, Food and Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 4.00% |  | 2.90%
Capital Equipment |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 128,706 |  | $ 141,479
Percent of Total Net Assets | 10.80% |  | 11.90%
Capital Equipment | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 17,986 |  | $ 25,014
Capital Equipment | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 5,271 |  | $ 9,208
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 5.20% |  | 5.80%
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.40% |  | 2.10%
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 6.60% |  | 8.40%
Chemicals, Plastics, and Rubber |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 35,897 |  | $ 47,076
Percent of Total Net Assets | 3.00% |  | 3.90%
Chemicals, Plastics, and Rubber | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 37,030 |  | $ 33,111
Chemicals, Plastics, and Rubber | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 2,942 |  | $ 2,772
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.50% |  | 1.90%
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.80% |  | 2.70%
Chemicals, Plastics, and Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 3.70% |  | 2.50%
Construction and Building |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 30,387 |  | $ 45,049
Percent of Total Net Assets | 2.50% |  | 3.80%
Construction and Building | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 16,942 |  | $ 17,616
Construction and Building | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 1,867 |  | $ 1,887
Construction and Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.20% |  | 1.80%
Construction and Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.30% |  | 1.50%
Construction and Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.40% |  | 1.70%
Consumer goods: Durable |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 47,074 |  | $ 43,932
Percent of Total Net Assets | 3.90% |  | 3.70%
Consumer goods: Durable | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 26,412 |  | $ 18,751
Consumer goods: Durable | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 1,042 |  | $ 1,272
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.90% |  | 1.80%
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.00% |  | 1.70%
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.30% |  | 1.10%
Consumer goods: Non-durable |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 28,210 |  | $ 27,693
Percent of Total Net Assets | 2.40% |  | 2.30%
Consumer goods: Non-durable | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 21,850 |  | $ 22,861
Consumer goods: Non-durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.10% |  | 1.10%
Consumer goods: Non-durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.70% |  | 1.90%
Containers, Packaging and Glass |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 37,524 |  | $ 37,877
Percent of Total Net Assets | 3.10% |  | 3.20%
Containers, Packaging and Glass | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 26,829 |  | $ 24,445
Containers, Packaging and Glass | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 0 |  | $ 1,812
Containers, Packaging and Glass | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.50% |  | 1.50%
Containers, Packaging and Glass | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.00% |  | 2.00%
Containers, Packaging and Glass | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.00% |  | 1.60%
Energy: Electricity |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 20,874 |  | $ 7,337
Percent of Total Net Assets | 1.70% |  | 0.60%
Energy: Electricity | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 20,250 |  | $ 15,375
Energy: Electricity | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.80% |  | 0.30%
Energy: Electricity | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.50% |  | 1.30%
Energy: Oil and Gas |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 3,240 |  | $ 4,776
Percent of Total Net Assets | 0.30% |  | 0.40%
Energy: Oil and Gas | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 6,724 |  | $ 5,726
Energy: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.10% |  | 0.20%
Energy: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.50% |  | 0.50%
Environmental Industries |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 53,484 |  | $ 51,006
Percent of Total Net Assets | 4.50% |  | 4.30%
Environmental Industries | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 6,986 |  | $ 7,314
Environmental Industries | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 3,487 |  | $ 7,797
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.10% |  | 2.10%
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.50% |  | 0.60%
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 4.40% |  | 7.10%
Forest Products & Paper | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 3,605 |  | $ 2,269
Forest Products & Paper | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.30% |  | 0.20%
Healthcare and Pharmaceuticals |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 216,952 |  | $ 203,576
Percent of Total Net Assets | 18.10% |  | 17.10%
Healthcare and Pharmaceuticals | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 141,070 |  | $ 128,983
Healthcare and Pharmaceuticals | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 12,880 |  | $ 13,614
Healthcare and Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 8.70% |  | 8.30%
Healthcare and Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 10.70% |  | 10.70%
Healthcare and Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 16.20% |  | 12.40%
High Tech Industries |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 303,082 |  | $ 300,980
Percent of Total Net Assets | 25.40% |  | 25.20%
High Tech Industries | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 174,572 |  | $ 141,906
High Tech Industries | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 14,661 |  | $ 13,713
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 12.20% |  | 12.30%
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 13.30% |  | 11.70%
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 18.40% |  | 12.50%
Hotel, Gaming and Leisure |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 54,256 |  | $ 54,023
Percent of Total Net Assets | 4.50% |  | 4.50%
Hotel, Gaming and Leisure | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 22,834 |  | $ 23,587
Hotel, Gaming and Leisure | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.20% |  | 2.20%
Hotel, Gaming and Leisure | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.70% |  | 2.00%
Investment Funds and Vehicles |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 110,066 |  | $ 130,427
Percent of Total Net Assets | 9.20% |  | 10.90%
Investment Funds and Vehicles | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 33,450 |  | $ 61,028
Investment Funds and Vehicles | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 4.40% |  | 5.30%
Investment Funds and Vehicles | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.50% |  | 5.00%
Media: Advertising, Printing and Publishing |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 39,447 |  | $ 55,477
Percent of Total Net Assets | 3.30% |  | 4.70%
Media: Advertising, Printing and Publishing | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 12,081 |  | $ 5,969
Media: Advertising, Printing and Publishing | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 0 |  | $ 10,032
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.60% |  | 2.30%
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.90% |  | 0.50%
Media: Advertising, Printing and Publishing | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.00% |  | 9.10%
Media: Broadcasting and Subscription |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 13,277 |  | $ 20,257
Percent of Total Net Assets | 1.10% |  | 1.70%
Media: Broadcasting and Subscription | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 31,201 |  | $ 34,676
Media: Broadcasting and Subscription | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.50% |  | 0.80%
Media: Broadcasting and Subscription | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.40% |  | 2.90%
Media: Diversified and Production |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 64,559 |  | $ 60,561
Percent of Total Net Assets | 5.40% |  | 5.10%
Media: Diversified and Production | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 34,391 |  | $ 28,897
Media: Diversified and Production | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 0 |  | $ 5,498
Media: Diversified and Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.60% |  | 2.50%
Media: Diversified and Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.60% |  | 2.40%
Media: Diversified and Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.00% |  | 5.00%
Metals and Mining |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 8,993 |  | $ 33,125
Percent of Total Net Assets | 0.80% |  | 2.80%
Metals and Mining | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 3,863 |  | $ 5,069
Metals and Mining | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.40% |  | 1.40%
Metals and Mining | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.30% |  | 0.40%
Retail | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 13,141 |  | $ 15,720
Retail | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 6,255 |  | $ 5,489
Retail | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.00% |  | 1.30%
Retail | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 7.90% |  | 5.00%
Services: Business |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 326,762 |  | $ 338,417
Percent of Total Net Assets | 27.30% |  | 28.40%
Services: Business | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 222,610 |  | $ 199,805
Services: Business | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 6,798 |  | $ 10,876
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 13.20% |  | 13.80%
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 16.90% |  | 16.50%
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 8.50% |  | 9.90%
Services: Consumer |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 61,409 |  | $ 67,070
Percent of Total Net Assets | 5.10% |  | 5.60%
Services: Consumer | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 58,632 |  | $ 52,543
Services: Consumer | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 8,525 |  | $ 8,265
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.50% |  | 2.70%
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 4.50% |  | 4.30%
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 10.70% |  | 7.50%
Structured Products |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 102,922 |  | $ 86,703
Percent of Total Net Assets | 8.60% |  | 7.30%
Structured Products | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 4.10% |  | 3.50%
Telecommunications |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 27,565 |  | $ 24,058
Percent of Total Net Assets | 2.30% |  | 2.00%
Telecommunications | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 36,027 |  | $ 38,034
Telecommunications | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.10% |  | 1.00%
Telecommunications | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 2.70% |  | 3.10%
Transportation: Cargo |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 96,450 |  | $ 89,398
Percent of Total Net Assets | 8.10% |  | 7.50%
Transportation: Cargo | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 57,575 |  | $ 56,018
Transportation: Cargo | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 6,296 |  | $ 6,221
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 3.90% |  | 3.70%
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 4.40% |  | 4.60%
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 7.90% |  | 5.60%
Transportation: Consumer |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 11,951 |  | $ 11,062
Percent of Total Net Assets | 1.00% |  | 0.90%
Transportation: Consumer | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 12,613 |  | $ 12,562
Transportation: Consumer | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 3,686 |  | $ 4,713
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.50% |  | 0.50%
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 1.00% |  | 1.00%
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 4.60% |  | 4.30%
Utilities: Electric |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 22,696 |  | $ 17,374
Percent of Total Net Assets | 1.90% |  | 1.50%
Utilities: Electric | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 9,396 |  | $ 4,194
Utilities: Electric | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.90% |  | 0.70%
Utilities: Electric | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.70% |  | 0.30%
Utilities: Oil and Gas |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 4,655 |  | $ 4,697
Percent of Total Net Assets | 0.40% |  | 0.40%
Utilities: Oil and Gas | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Fair Value | $ 6,838 |  | $ 6,900
Utilities: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.20% |  | 0.20%
Utilities: Oil and Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of Total Portfolio | 0.50% |  | 0.60%
[1] | Fair value as a percentage of net assets.

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