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INVESTMENTS - Schedule of Industry Composition of Investment at Fair Value (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Fair Value $ 2,536,315 [1] $ 2,449,272 [2]
Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value 1,194,961 1,095,308
Jocassee Partners LLC | Investment, Excluding Short Term Investment, with Previous Commitment to Provide Financing    
Schedule of Investments [Line Items]    
Fair Value 1,183,290 1,085,025
Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 13,768 $ 33,422
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 & Defense | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 66,732 $ 61,069
Aerospace & Defense | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 6.00% 6.00%
Automotive | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 11,341 $ 11,236
Automotive | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 2,746
Automotive | 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%
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 8.00%
Banking, Finance, Insurance, & Real Estate | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 114,462 $ 115,269
Banking, Finance, Insurance, & Real Estate | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 22 $ 33
Banking, Finance, Insurance, & Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 10.00% 11.00%
Banking, Finance, Insurance, & 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% 0.00%
Beverage, Food, & Tobacco | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 32,437 $ 28,657
Beverage, Food, & Tobacco | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 3,578
Beverage, Food, & Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.00% 3.00%
Beverage, Food, & Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 11.00%
Capital Equipment | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 39,637 $ 13,376
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.00% 1.00%
Chemicals, Plastics, & Rubber | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 26,448 $ 30,248
Chemicals, Plastics, & Rubber | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 2,954
Chemicals, Plastics, & Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 3.00%
Chemicals, Plastics, & Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 9.00%
Construction & Building | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 24,080 $ 21,805
Construction & Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.00%
Consumer goods: Durable | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 24,600 $ 26,531
Consumer goods: Durable | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 232
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 2.00% 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 0.00% 1.00%
Consumer goods: Non-durable | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 23,429 $ 21,629
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% 2.00%
Containers, Packaging, & Glass | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 32,719 $ 28,616
Containers, Packaging, & Glass | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.00% 3.00%
Energy: Electricity | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 8,937 $ 10,005
Energy: Electricity | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.00%
Energy: Oil & Gas | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 12,004 $ 11,209
Energy: Oil & Gas | 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%
Environmental Industries | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 14,520 $ 6,237
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 0.00%
Forest Products & Paper | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 2,018 $ 1,156
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 0.00% 0.00%
Healthcare & Pharmaceuticals | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 133,698 $ 113,530
Healthcare & Pharmaceuticals | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 3,821
Healthcare & Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 11.00% 10.00%
Healthcare & Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 11.00%
High Tech Industries | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 111,563 $ 87,247
High Tech Industries | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 9,402 $ 9,363
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 10.00% 8.00%
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 68.00% 28.00%
Hotel, Gaming, & Leisure | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 27,652 $ 22,031
Hotel, Gaming, & Leisure | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.00%
Investment Funds & Vehicles | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 11,886 $ 20,427
Investment Funds & Vehicles | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 2.00%
Media: Advertising, Printing, & Publishing | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 10,142 $ 10,420
Media: Advertising, Printing, & 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% 1.00%
Media: Broadcasting & Subscription | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 16,069 $ 17,297
Media: Broadcasting & Subscription | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 2.00%
Media: Diversified & Production | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 48,282 $ 41,913
Media: Diversified & Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 4.00%
Metals & Mining | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 4,661 $ 4,028
Metals & Mining | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Retail | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 9,726 $ 12,361
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%
Services: Business | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 212,533 $ 213,492
Services: Business | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 4,344 $ 4,411
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 18.00% 20.00%
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 32.00% 13.00%
Services: Consumer | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 63,644 $ 58,080
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% 5.00%
Telecommunications | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 36,630 $ 36,205
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% 3.00%
Transportation: Cargo | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 41,779 $ 41,968
Transportation: Cargo | Sierra JV    
Schedule of Investments [Line Items]    
Fair Value $ 0 $ 6,284
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% 4.00%
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 19.00%
Transportation: Consumer | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 8,306 $ 8,529
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%
Utilities: Electric | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 12,231 $ 10,454
Utilities: Electric | 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%
Utilities: Oil & Gas | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Fair Value $ 1,124 $ 0
Utilities: Oil & 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% 0.00%
[1] All of the investment is or will be encumbered as security for the Company’s $0.7 billion senior secured credit facility with ING Capital LLC (“ING”) 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 $0.8 billion February 2019 Credit Facility with ING.