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Investments - Schedule of Composition of Investment Portfolio at Cost And Fair Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Cost $ 2,522,696 $ 2,535,576
Total investments at fair value $ 2,449,272 $ 2,488,715
Percent of Total Net Assets 205.80% [1] 208.00% [2]
Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 1,158,999 $ 1,375,734
Total investments at fair value 1,095,308 1,330,526
Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost 207,570 386,657
Total investments at fair value 193,351 366,731
Sierra JV    
Schedule of Investments [Line Items]    
Cost 36,083 85,304
Total investments at fair value $ 33,422 $ 79,599
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent 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]    
Percent 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]    
Percent of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent 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]    
Percent 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]    
Percent 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]    
Percent of Total Portfolio 100.00% 100.00%
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Cost $ 1,747,841 $ 1,705,353
Total investments at fair value $ 1,686,411 $ 1,670,300
Percent of Total Net Assets 142.00% 140.00%
Senior debt and 1st lien notes | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 1,092,038 $ 1,284,098
Total investments at fair value 1,052,366 1,260,183
Senior debt and 1st lien notes | Sierra JV    
Schedule of Investments [Line Items]    
Cost 36,083 85,304
Total investments at fair value $ 33,389 $ 79,599
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 69.00% 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]    
Percent of Total Portfolio 94.00% 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]    
Percent 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]    
Percent of Total Portfolio 69.00% 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]    
Percent of Total Portfolio 96.00% 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]    
Percent of Total Portfolio 100.00% 100.00%
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Cost $ 184,043 $ 256,850
Total investments at fair value $ 165,455 $ 238,215
Percent of Total Net Assets 14.00% 20.00%
Subordinated debt and 2nd lien notes | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 11,388 $ 21,728
Total investments at fair value $ 11,141 $ 21,262
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 7.00% 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]    
Percent of Total Portfolio 1.00% 2.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 7.00% 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]    
Percent of Total Portfolio 1.00% 2.00%
Structured Product    
Schedule of Investments [Line Items]    
Cost $ 89,543 $ 107,314
Total investments at fair value $ 79,548 $ 93,038
Percent of Total Net Assets 7.00% 8.00%
Structured Product | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 4.00% 4.00%
Structured Product | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 3.00% 4.00%
Equity shares    
Schedule of Investments [Line Items]    
Cost $ 360,691 $ 320,335
Total investments at fair value $ 409,129 $ 374,704
Percent of Total Net Assets 34.00% 31.00%
Equity shares | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 874 $ 449
Total investments at fair value 636 $ 268
Equity shares | Sierra JV    
Schedule of Investments [Line Items]    
Cost 0  
Total investments at fair value $ 33  
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 14.00% 13.00%
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent 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]    
Percent of Total Portfolio 0.00%  
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 17.00% 15.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent 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]    
Percent of Total Portfolio 0.00%  
Equity warrants    
Schedule of Investments [Line Items]    
Cost $ 76 $ 76
Total investments at fair value $ 2,732 $ 2,392
Percent of Total Net Assets 0.00% 0.00%
Equity warrants | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 0 $ 0
Total investments at fair value $ 455 $ 467
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent 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]    
Percent 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]    
Percent 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]    
Percent of Total Portfolio 0.00% 0.00%
Royalty Rights    
Schedule of Investments [Line Items]    
Cost $ 3,627  
Total investments at fair value $ 5,833  
Percent of Total Net Assets 1.00%  
Royalty Rights | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00%  
Royalty Rights | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00%  
Investments in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Cost $ 136,875 $ 145,648
Total investments at fair value $ 100,164 $ 110,066
Percent of Total Net Assets 8.00% 9.00%
Investments in joint ventures / PE fund | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 6.00% 6.00%
Investments in joint ventures / PE fund | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 4.00% 4.00%
Investment in joint ventures | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 44,416 $ 54,563
Total investments at fair value $ 20,427 $ 33,450
Investment in joint ventures | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent 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]    
Percent of Total Portfolio 2.00% 2.00%
Short-Term Investments [Member] | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Cost $ 10,283 $ 14,896
Total investments at fair value $ 10,283 $ 14,896
Short-Term Investments [Member] | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.00% 1.00%
Short-Term Investments [Member] | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.00% 1.00%
Federal Housing Administration (“FHA”) loans | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost $ 193,265 $ 360,847
Total investments at fair value $ 179,963 $ 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]    
Percent 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]    
Percent of Total Portfolio 93.00% 93.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Cost $ 14,305 $ 25,810
Total investments at fair value $ 13,388 $ 24,491
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Thompson Rivers LLC    
Schedule of Investments [Line Items]    
Percent 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]    
Percent 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.