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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 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 402,412 212,752
Investment restructuring   (22,249)
Transfers into Level 3 5,989  
Transfers out of Level 3 (13,918)  
Transfers into (out of) Level 3, net   (1,992)
Proceeds from sales of investments / return of capital (71,943) (24,527)
Loan origination fees received (8,243) (3,769)
Principal repayments received (168,843) (223,865)
Fair value end of period 2,441,403 2,167,560
Payment-in-kind interest / dividends    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value recurring basis gain (losses) $ 13,444 $ 9,559
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) $ 159 $ 276
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) $ 5,213 $ 5,456
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) $ (24,721) $ (16,332)
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) $ 56,946 $ (5,280)
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 331,359 176,984
Investment restructuring   (22,249)
Transfers into Level 3 0  
Transfers out of Level 3 0  
Transfers into (out of) Level 3, net   (1,862)
Proceeds from sales of investments / return of capital (61,189) (18,512)
Loan origination fees received (6,628) (3,473)
Principal repayments received (121,005) (191,286)
Fair value end of period 1,795,252 1,519,947
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) $ 4,148 $ 2,002
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) $ 159 $ 221
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) $ 4,626 $ 4,969
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) $ (18,792) $ (7,040)
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) $ 37,073 $ (13,604)
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 46,395 26,325
Investment restructuring   0
Transfers into Level 3 5,989  
Transfers out of Level 3 (6,523)  
Transfers into (out of) Level 3, net   0
Proceeds from sales of investments / return of capital (3) (4,975)
Loan origination fees received (1,615) (296)
Principal repayments received (16,935) (32,222)
Fair value end of period 184,616 213,023
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) $ 2,267 $ 1,708
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 $ 55
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) $ 444 $ 487
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) $ (9,417) $ (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) $ 10,311 $ 3,250
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 48
Investment restructuring   0
Transfers into Level 3 0  
Transfers out of Level 3 (3,310)  
Transfers into (out of) Level 3, net   0
Proceeds from sales of investments / return of capital (1,933) 0
Loan origination fees received 0 0
Principal repayments received (30,903) (357)
Fair value end of period 19,254 45,500
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) $ (1,595) $ (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) $ 688 $ 2,843
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 17,158 5,524
Investment restructuring   0
Transfers into Level 3 0  
Transfers out of Level 3 (4,085)  
Transfers into (out of) Level 3, net   (130)
Proceeds from sales of investments / return of capital (4,065) (1,040)
Loan origination fees received 0 0
Principal repayments received 0 0
Fair value end of period 439,652 382,595
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) $ 7,029 $ 5,849
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) $ 2,616 $ (4,179)
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) $ 12,524 $ 1,999
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 Level 3 0  
Transfers out of Level 3 0  
Transfers into (out of) Level 3, net   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 1,087 2,624
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) $ (1,645) $ 232
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 $ 0
New investments 0 3,871
Investment restructuring   0
Transfers into Level 3 0  
Transfers out of Level 3 0  
Transfers into (out of) Level 3, net   0
Proceeds from sales of investments / return of capital (4,753) 0
Loan origination fees received 0 0
Principal repayments received 0 0
Fair value end of period 1,542 3,871
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 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 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 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) $ 2,467 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) $ (2,005) $ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized appreciation (depreciation) on investments