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Investments - Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Total    
Fair value, beginning of period $ 2,237,531 $ 2,127,521
New investments 624,436 568,446
Investment restructuring (22,249)  
Transfers into (out of) Level 3, net 2,703 1,886
Proceeds from sales of investments / return of capital (86,264) (259,205)
Loan origination fees received (8,694) (8,286)
Principal repayments received (477,826) (236,821)
Fair value, end of period 2,244,908 2,237,531
Cost 2,522,696 2,535,576
Total investments at fair value $ 2,449,272 $ 2,488,715
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 100.00% 100.00%
Sierra JV    
Total    
Cost $ 36,083 $ 85,304
Total investments at fair value $ 33,422 $ 79,599
Sierra JV | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 100.00% 100.00%
Sierra JV | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 100.00% 100.00%
Payment-in-kind interest / dividends    
Total    
Realized gain (loss) $ 21,263 $ 25,311
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total payment-in-kind interest income Total payment-in-kind interest income
Accretion of loan premium / discount    
Total    
Realized gain (loss) $ 752 $ 1,584
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Accretion of deferred loan origination revenue    
Total    
Realized gain (loss) $ 11,569 $ 8,122
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Realized gain (loss)    
Total    
Realized gain (loss) $ (31,861) $ (46,340)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) on investments Net realized gains (losses) on investments
Unrealized appreciation (depreciation)    
Total    
Realized gain (loss) $ (26,452) $ 55,313
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments Net unrealized appreciation (depreciation) on investments
Senior debt and 1st lien notes    
Total    
Fair value, beginning of period $ 1,593,797 $ 1,591,356
New investments 559,616 396,040
Investment restructuring (27,652)  
Transfers into (out of) Level 3, net (2,366) (15,843)
Proceeds from sales of investments / return of capital (75,275) (246,902)
Loan origination fees received (8,398) (8,173)
Principal repayments received (380,761) (151,817)
Fair value, end of period 1,625,501 1,593,797
Cost 1,747,841 1,705,353
Total investments at fair value $ 1,686,411 $ 1,670,300
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Total    
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    
Total    
Percent of Total Portfolio 69.00% 67.00%
Senior debt and 1st lien notes | Sierra JV    
Total    
Cost $ 36,083 $ 85,304
Total investments at fair value $ 33,389 $ 79,599
Senior debt and 1st lien notes | Sierra JV | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 100.00% 100.00%
Senior debt and 1st lien notes | Sierra JV | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 100.00% 100.00%
Senior debt and 1st lien notes | Payment-in-kind interest / dividends    
Total    
Realized gain (loss) $ 7,711 $ 6,757
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total payment-in-kind interest income Total payment-in-kind interest income
Senior debt and 1st lien notes | Accretion of loan premium / discount    
Total    
Realized gain (loss) $ 637 $ 668
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Senior debt and 1st lien notes | Accretion of deferred loan origination revenue    
Total    
Realized gain (loss) $ 10,313 $ 7,420
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Senior debt and 1st lien notes | Realized gain (loss)    
Total    
Realized gain (loss) $ (24,371) $ (1,746)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) on investments Net realized gains (losses) on investments
Senior debt and 1st lien notes | Unrealized appreciation (depreciation)    
Total    
Realized gain (loss) $ (27,750) $ 16,037
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments Net unrealized appreciation (depreciation) on investments
Equity shares    
Total    
Fair value, beginning of period $ 374,572 $ 283,067
New investments 22,934 94,595
Investment restructuring 15,023  
Transfers into (out of) Level 3, net (2,556) 914
Proceeds from sales of investments / return of capital (4,834) (8,977)
Loan origination fees received 0 0
Principal repayments received 0 0
Fair value, end of period 408,475 374,572
Cost 360,691 320,335
Total investments at fair value $ 409,129 $ 374,704
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 14.00% 13.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 17.00% 15.00%
Equity shares | Sierra JV    
Total    
Cost $ 0  
Total investments at fair value $ 33  
Equity shares | Sierra JV | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 0.00%  
Equity shares | Sierra JV | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 0.00%  
Equity shares | Payment-in-kind interest / dividends    
Total    
Realized gain (loss) $ 9,884 $ 8,677
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total payment-in-kind interest income Total payment-in-kind interest income
Equity shares | Accretion of loan premium / discount    
Total    
Realized gain (loss) $ 0 $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Equity shares | Accretion of deferred loan origination revenue    
Total    
Realized gain (loss) $ 0 $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Equity shares | Realized gain (loss)    
Total    
Realized gain (loss) $ (1,171) $ (590)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) on investments Net realized gains (losses) on investments
Equity shares | Unrealized appreciation (depreciation)    
Total    
Realized gain (loss) $ (5,377) $ (3,114)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments Net unrealized appreciation (depreciation) on investments
Subordinated debt and 2nd lien notes    
Total    
Fair value, beginning of period $ 223,798 $ 234,214
New investments 37,466 49,525
Investment restructuring (9,620)  
Transfers into (out of) Level 3, net 0 16,815
Proceeds from sales of investments / return of capital (4,975) (2,800)
Loan origination fees received (296) (113)
Principal repayments received (94,066) (83,986)
Fair value, end of period 153,703 223,798
Cost 184,043 256,850
Total investments at fair value $ 165,455 $ 238,215
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Total    
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    
Total    
Percent of Total Portfolio 7.00% 10.00%
Subordinated debt and 2nd lien notes | Payment-in-kind interest / dividends    
Total    
Realized gain (loss) $ 3,668 $ 9,877
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total payment-in-kind interest income Total payment-in-kind interest income
Subordinated debt and 2nd lien notes | Accretion of loan premium / discount    
Total    
Realized gain (loss) $ 115 $ 916
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Subordinated debt and 2nd lien notes | Accretion of deferred loan origination revenue    
Total    
Realized gain (loss) $ 1,256 $ 702
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Subordinated debt and 2nd lien notes | Realized gain (loss)    
Total    
Realized gain (loss) $ (6,361) $ (43,902)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) on investments Net realized gains (losses) on investments
Subordinated debt and 2nd lien notes | Unrealized appreciation (depreciation)    
Total    
Realized gain (loss) $ 2,718 $ 42,550
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments Net unrealized appreciation (depreciation) on investments
Structured Product    
Total    
Fair value, beginning of period $ 42,972 $ 17,827
New investments 549 28,286
Investment restructuring 0  
Transfers into (out of) Level 3, net 7,625 0
Proceeds from sales of investments / return of capital (935) (526)
Loan origination fees received 0 0
Principal repayments received (2,999) (1,018)
Fair value, end of period 48,664 42,972
Cost 89,543 107,314
Total investments at fair value $ 79,548 $ 93,038
Structured Product | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 4.00% 4.00%
Structured Product | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 3.00% 4.00%
Structured Product | Payment-in-kind interest / dividends    
Total    
Realized gain (loss) $ 0 $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total payment-in-kind interest income Total payment-in-kind interest income
Structured Product | Accretion of loan premium / discount    
Total    
Realized gain (loss) $ 0 $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Structured Product | Accretion of deferred loan origination revenue    
Total    
Realized gain (loss) $ 0 $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Structured Product | Realized gain (loss)    
Total    
Realized gain (loss) $ 42 $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) on investments Net realized gains (losses) on investments
Structured Product | Unrealized appreciation (depreciation)    
Total    
Realized gain (loss) $ 1,410 $ (1,597)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments Net unrealized appreciation (depreciation) on investments
Equity warrants    
Total    
Fair value, beginning of period $ 2,392 $ 1,057
New investments 0 0
Investment restructuring 0  
Transfers into (out of) Level 3, net 0 0
Proceeds from sales of investments / return of capital 0 0
Loan origination fees received 0 0
Principal repayments received 0 0
Fair value, end of period 2,732 2,392
Cost 76 76
Total investments at fair value $ 2,732 $ 2,392
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 0.00% 0.00%
Equity warrants | Payment-in-kind interest / dividends    
Total    
Realized gain (loss) $ 0 $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total payment-in-kind interest income Total payment-in-kind interest income
Equity warrants | Accretion of loan premium / discount    
Total    
Realized gain (loss) $ 0 $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Equity warrants | Accretion of deferred loan origination revenue    
Total    
Realized gain (loss) $ 0 $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees Interest and other financing fees
Equity warrants | Realized gain (loss)    
Total    
Realized gain (loss) $ 0 $ (102)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) on investments Net realized gains (losses) on investments
Equity warrants | Unrealized appreciation (depreciation)    
Total    
Realized gain (loss) $ 340 $ 1,437
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments Net unrealized appreciation (depreciation) on investments
Royalty Rights    
Total    
Fair value, beginning of period $ 0  
New investments 3,871  
Investment restructuring 0  
Transfers into (out of) Level 3, net 0  
Proceeds from sales of investments / return of capital (245)  
Loan origination fees received 0  
Principal repayments received 0  
Fair value, end of period 5,833 $ 0
Cost 3,627  
Total investments at fair value $ 5,833  
Royalty Rights | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 0.00%  
Royalty Rights | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Total    
Percent of Total Portfolio 0.00%  
Royalty Rights | Payment-in-kind interest / dividends    
Total    
Realized gain (loss) $ 0  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total payment-in-kind interest income  
Royalty Rights | Accretion of loan premium / discount    
Total    
Realized gain (loss) $ 0  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees  
Royalty Rights | Accretion of deferred loan origination revenue    
Total    
Realized gain (loss) $ 0  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest and other financing fees  
Royalty Rights | Realized gain (loss)    
Total    
Realized gain (loss) $ 0  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) on investments  
Royalty Rights | Unrealized appreciation (depreciation)    
Total    
Realized gain (loss) $ 2,207  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments