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INVESTMENTS - Schedule of Composition of Investment Portfolio at Cost And Fair Value (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Cost $ 2,610,675 $ 2,522,696
Fair Value $ 2,571,228 $ 2,449,272
Percentage of Total Net Assets 216.30% [1] 205.80% [2]
Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 1,140,101 $ 1,158,999
Fair Value 1,081,889 1,095,308
Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost 180,286 207,570
Fair Value 169,484 193,351
Sierra JV    
Schedule of Investments [Line Items]    
Cost 27,686 36,083
Fair Value $ 25,115 $ 33,422
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 $ 1,874,402 $ 1,747,841
Fair Value $ 1,819,640 $ 1,686,411
Percentage of Total Net Assets 153.00% 142.00%
Senior debt and 1st lien notes | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 1,070,331 $ 1,092,038
Fair Value 1,036,494 1,052,366
Senior debt and 1st lien notes | Sierra JV    
Schedule of Investments [Line Items]    
Cost 27,686 36,083
Fair Value $ 25,115 $ 33,389
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 72.00% 69.00%
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 94.00% 94.00%
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 71.00% 69.00%
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 96.00% 96.00%
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 $ 166,374 $ 184,043
Fair Value $ 159,085 $ 165,455
Percentage of Total Net Assets 13.00% 14.00%
Subordinated debt and 2nd lien notes | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 11,879 $ 11,388
Fair Value $ 11,645 $ 11,141
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 6.00% 7.00%
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 1.00% 1.00%
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 6.00% 7.00%
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 1.00% 1.00%
Structured products    
Schedule of Investments [Line Items]    
Cost $ 63,423 $ 89,543
Fair Value $ 53,766 $ 79,548
Percentage of Total Net Assets 4.00% 7.00%
Structured products | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 3.00% 4.00%
Structured products | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 2.00% 3.00%
Equity shares    
Schedule of Investments [Line Items]    
Cost $ 376,154 $ 360,691
Fair Value $ 434,144 $ 409,129
Percentage of Total Net Assets 37.00% 34.00%
Equity shares | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 874 $ 874
Fair Value $ 611 636
Equity shares | Sierra JV    
Schedule of Investments [Line Items]    
Cost   0
Fair Value   $ 33
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 14.00% 14.00%
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 Cost | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio   0.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 17.00% 17.00%
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 shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio   0.00%
Equity warrants    
Schedule of Investments [Line Items]    
Cost $ 76 $ 76
Fair Value $ 2,802 $ 2,732
Percentage of Total Net Assets 0.00% 0.00%
Equity warrants | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 0 $ 0
Fair Value $ 433 $ 455
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 $ 3,544 $ 3,627
Fair Value $ 6,379 $ 5,833
Percentage of Total Net Assets 1.00% 1.00%
Royalty rights | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 0.00% 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% 0.00%
Investment in joint ventures    
Schedule of Investments [Line Items]    
Cost $ 126,702  
Fair Value $ 95,412  
Percentage of Total Net Assets 8.00%  
Investment in joint ventures | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 41,378 $ 44,416
Fair Value $ 17,067 $ 20,427
Investment in joint ventures | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 5.00%  
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    
Schedule of Investments [Line Items]    
Percentage of Total Portfolio 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%
Investment in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Cost   $ 136,875
Fair Value   $ 100,164
Percentage of Total Net Assets   8.00%
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%
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%
Short-term investments | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 15,639 $ 10,283
Fair Value $ 15,639 $ 10,283
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 $ 168,675 $ 193,265
Fair Value $ 158,498 $ 179,963
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 94.00% 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 94.00% 93.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost $ 11,611 $ 14,305
Fair Value $ 10,986 $ 13,388
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 6.00% 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 6.00% 7.00%
[1] Fair value as a percentage of net assets.
[2] Fair value as a percentage of net assets.