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INVESTMENTS - Schedule of Composition of Investment Portfolio at Cost And Fair Value (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Cost $ 2,446,920 $ 2,535,576
Fair Value $ 2,416,714 $ 2,488,715
Percentage of Total Net Assets 202.30% [1] 208.00% [2]
Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 1,202,818 $ 1,375,734
Fair Value 1,162,575 1,330,526
Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost 234,842 386,657
Fair Value 224,600 366,731
Sierra JV    
Schedule of Investments [Line Items]    
Cost 42,464 85,304
Fair Value $ 39,976 $ 79,599
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type 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 | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Cost $ 1,659,800 $ 1,705,353
Fair Value $ 1,632,057 $ 1,670,300
Percentage of Total Net Assets 137.00% 140.00%
Senior debt and 1st lien notes | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 1,122,271 $ 1,284,098
Fair Value 1,105,053 1,260,183
Senior debt and 1st lien notes | Sierra JV    
Schedule of Investments [Line Items]    
Cost 42,464 85,304
Fair Value $ 39,976 $ 79,599
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 68.00% 67.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 93.00% 93.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 68.00% 67.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 95.00% 95.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 100.00% 100.00%
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Cost $ 214,860 $ 256,850
Fair Value $ 199,971 $ 238,215
Percentage of Total Net Assets 17.00% 20.00%
Subordinated debt and 2nd lien notes | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 20,176 $ 21,728
Fair Value $ 20,333 $ 21,262
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 9.00% 10.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 8.00% 10.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.00%
Structured products    
Schedule of Investments [Line Items]    
Cost $ 99,154 $ 107,314
Fair Value $ 91,493 $ 93,038
Percentage of Total Net Assets 7.00% 8.00%
Structured products | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 4.00%
Structured products | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 4.00%
Equity shares    
Schedule of Investments [Line Items]    
Cost $ 328,635 $ 320,335
Fair Value $ 382,531 $ 374,704
Percentage of Total Net Assets 32.00% 31.00%
Equity shares | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 449 $ 449
Fair Value $ 239 $ 268
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 13.00% 13.00%
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 16.00% 15.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants    
Schedule of Investments [Line Items]    
Cost $ 76 $ 76
Fair Value $ 2,600 $ 2,392
Percentage of Total Net Assets 0.00% 0.00%
Equity warrants | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 0 $ 0
Fair Value $ 449 $ 467
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 0.00%
Royalty rights    
Schedule of Investments [Line Items]    
Cost $ 3,790  
Fair Value $ 3,819  
Percentage of Total Net Assets 0.00%  
Royalty rights | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00%  
Royalty rights | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00%  
Investment in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Cost $ 140,605 $ 145,648
Fair Value $ 104,243 $ 110,066
Percentage of Total Net Assets 9.00% 9.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 6.00% 6.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 4.00%
Investment in joint ventures | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 47,892 $ 54,563
Fair Value $ 24,471 $ 33,450
Investment in joint ventures | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 4.00% 4.00%
Investment in joint ventures | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 2.00%
Long-Term Investments | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 1,202,800 $ 1,375,700
Fair Value 1,162,600 1,330,500
Short-term investments | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost 12,030 14,896
Fair Value $ 12,030 $ 14,896
Short-term investments | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.00%
Short-term investments | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 1.00% 1.00%
Federal Housing Administration (“FHA”) loans | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost $ 218,501 $ 360,847
Fair Value $ 208,953 $ 342,240
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 93.00% 93.00%
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 93.00% 93.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost $ 16,341 $ 25,810
Fair Value $ 15,647 $ 24,491
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 7.00% 7.00%
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 7.00% 7.00%
[1] Fair value as a percentage of net assets.
[2] Fair value as a percentage of net assets.