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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value beginning of period $ 2,244,908 $ 2,237,531
New investments 207,071 141,053
Investment restructuring   (22,249)
Transfers into (out of) Level 3, net   (7,425)
Transfers out of Level 3 (10,608)  
Proceeds from sales of investments / return of capital (2,624) (187)
Loan origination fees received (4,161) (2,519)
Principal repayments received (90,530) (89,648)
Fair value end of period 2,369,992 2,266,459
Payment-in-kind interest / dividends    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 5,640 $ 4,346
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 85 $ 161
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 2,648 $ 2,399
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)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ (10,350) $ (12,641)
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)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 27,913 $ 15,638
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value beginning of period $ 1,625,501 $ 1,593,797
New investments 184,010 117,843
Investment restructuring   (22,249)
Transfers into (out of) Level 3, net   (2,596)
Transfers out of Level 3 0  
Proceeds from sales of investments / return of capital (347) (187)
Loan origination fees received (4,156) (2,238)
Principal repayments received (48,208) (78,200)
Fair value end of period 1,767,792 1,595,417
Senior debt and 1st lien notes | Payment-in-kind interest / dividends    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 2,125 $ 921
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 85 $ 134
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 2,257 $ 2,266
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)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ (486) $ (7,528)
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)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 7,011 $ (6,546)
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value beginning of period $ 153,703 $ 223,798
New investments 1,974 18,330
Investment restructuring   0
Transfers into (out of) Level 3, net   0
Transfers out of Level 3 (6,523)  
Proceeds from sales of investments / return of capital (3) 0
Loan origination fees received (5) (281)
Principal repayments received (12,592) (11,091)
Fair value end of period 140,472 232,208
Subordinated debt and 2nd lien notes | Payment-in-kind interest / dividends    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 942 $ 1,363
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 0 $ 27
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 248 $ 133
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)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ (8,517) $ (5,107)
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)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 11,245 $ 5,036
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 products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value beginning of period $ 48,664 $ 42,972
New investments 7,500 49
Investment restructuring   0
Transfers into (out of) Level 3, net   0
Transfers out of Level 3 0  
Proceeds from sales of investments / return of capital (1,251) 0
Loan origination fees received 0 0
Principal repayments received (29,730) (357)
Fair value end of period 23,504 45,209
Structured products | Payment-in-kind interest / dividends    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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 products | Accretion of loan premium / discount    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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 products | Accretion of deferred loan origination revenue    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 143 $ 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 products | Realized gain (loss)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ (1,590) $ (6)
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 products | Unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ (232) $ 2,551
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value beginning of period $ 408,475 $ 374,572
New investments 13,587 4,831
Investment restructuring   0
Transfers into (out of) Level 3, net   (4,829)
Transfers out of Level 3 (4,085)  
Proceeds from sales of investments / return of capital (940) 0
Loan origination fees received 0 0
Principal repayments received 0 0
Fair value end of period 429,043 391,116
Equity shares | Payment-in-kind interest / dividends    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 2,573 $ 2,062
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 243 $ 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
Equity shares | Unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 9,190 $ 14,480
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value beginning of period $ 2,732 $ 2,392
New investments 0 0
Investment restructuring   0
Transfers into (out of) Level 3, net   0
Transfers out of Level 3 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 2,802 2,509
Equity warrants | Payment-in-kind interest / dividends    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 0 $ 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
Equity warrants | Unrealized appreciation (depreciation)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 70 $ 117
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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value beginning of period $ 5,833  
New investments 0  
Transfers out of Level 3 0  
Proceeds from sales of investments / return of capital (83)  
Loan origination fees received 0  
Principal repayments received 0  
Fair value end of period 6,379  
Royalty rights | Payment-in-kind interest / dividends    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 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)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 629  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments