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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value beginning of period | $ 2,244,908,000 | $ 2,237,531,000 |
New investments | 545,609,000 | 331,922,000 |
Investment restructuring | 0 | (22,249,000) |
Transfers into Level 3 | 5,989,000 |  |
Transfers out of Level 3 | (26,625,000) |  |
Transfers into (out of) Level 3, net |  | (12,039,000) |
Proceeds from sales of investments / return of capital | (176,846,000) | (27,806,000) |
Loan origination fees received | (9,579,000) | (5,759,000) |
Principal repayments received | (260,940,000) | (334,936,000) |
Fair value end of period | 2,371,108,000 | 2,177,434,000 |
Payment-in-kind interest / dividends |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value recurring basis gain (losses) | $ 19,540,000 | $ 13,968,000 |
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) | $ 248,000 | $ 396,000 |
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) | $ 7,958,000 | $ 8,042,000 |
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) | $ (25,821,000) | $ (26,433,000) |
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) | $ 46,667,000 | $ 14,797,000 |
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 | $ 1,625,501,000 | $ 1,593,797,000 |
New investments | 459,219,000 | 291,822,000 |
Investment restructuring | 424,000 | (22,249,000) |
Transfers into Level 3 | 0 |  |
Transfers out of Level 3 | 0 |  |
Transfers into (out of) Level 3, net |  | (5,770,000) |
Proceeds from sales of investments / return of capital | (154,807,000) | (18,512,000) |
Loan origination fees received | (7,929,000) | (5,463,000) |
Principal repayments received | (208,334,000) | (271,403,000) |
Fair value end of period | $ 1,738,067,000 | 1,559,820,000 |
Senior debt and 1st lien notes | Fair Value, Inputs, Level 3 | Transaction Price | Recent Transaction | Maximum |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Input | 1.000 |  | 1.000
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) | $ 6,831,000 | $ 4,590,000 |
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) | $ 248,000 | $ 313,000 |
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) | $ 7,200,000 | $ 7,391,000 |
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) | $ (23,320,000) | $ (19,528,000) |
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) | $ 33,034,000 | $ 4,832,000 |
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 | $ 153,703,000 | $ 223,798,000 |
New investments | 60,065,000 | 28,741,000 |
Investment restructuring | (424,000) | 0 |
Transfers into Level 3 | 5,989,000 |  |
Transfers out of Level 3 | (10,159,000) |  |
Transfers into (out of) Level 3, net |  | 0 |
Proceeds from sales of investments / return of capital | 0 | (4,975,000) |
Loan origination fees received | (1,650,000) | (296,000) |
Principal repayments received | (20,684,000) | (62,050,000) |
Fair value end of period | $ 191,672,000 | 187,305,000 |
Subordinated debt and 2nd lien notes | Fair Value, Inputs, Level 3 | Transaction Price | Recent Transaction |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Input | 1.000 |  | 0.980
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) | $ 3,824,000 | $ 1,313,000 |
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 | $ 83,000 |
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) | $ 615,000 | $ 651,000 |
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) | $ (9,384,000) | $ (5,461,000) |
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) | $ 9,777,000 | $ 5,501,000 |
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 | $ 48,664,000 | $ 42,972,000 |
New investments | 7,500,000 | 48,000 |
Investment restructuring | 0 | 0 |
Transfers into Level 3 | 0 |  |
Transfers out of Level 3 | (3,310,000) |  |
Transfers into (out of) Level 3, net |  | 0 |
Proceeds from sales of investments / return of capital | (1,998,000) | 0 |
Loan origination fees received | 0 | 0 |
Principal repayments received | (31,922,000) | (1,483,000) |
Fair value end of period | 17,777,000 | 45,682,000 |
Structured products | Fair Value, Inputs, Level 3 | Transaction Price | Recent Transaction |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Input |  |  | 1.000
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) | $ 143,000 | $ 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) | $ (1,560,000) | $ 42,000 |
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) | $ 260,000 | $ 4,103,000 |
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 | $ 408,475,000 | $ 374,572,000 |
New investments | 18,825,000 | 7,440,000 |
Investment restructuring | 0 | 0 |
Transfers into Level 3 | 0 |  |
Transfers out of Level 3 | (13,156,000) |  |
Transfers into (out of) Level 3, net |  | (6,269,000) |
Proceeds from sales of investments / return of capital | (15,265,000) | (4,238,000) |
Loan origination fees received | 0 | 0 |
Principal repayments received | 0 | 0 |
Fair value end of period | $ 420,943,000 | 378,208,000 |
Equity shares | Fair Value, Inputs, Level 3 | Liabilities | Net Asset Approach |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Input |  |  | 96,678,300
Equity shares | Fair Value, Inputs, Level 3 | Liabilities | Net Asset Approach | Maximum |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Input | 117,088,000 |  |
Equity shares | Fair Value, Inputs, Level 3 | Transaction Price | Recent Transaction | Maximum |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Input | 100.00 |  | 1,847.58
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) | $ 8,885,000 | $ 8,065,000 |
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) | $ 5,976,000 | $ (1,486,000) |
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) | $ 7,203,000 | $ 124,000 |
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 | $ 2,732,000 | $ 2,392,000 |
New investments | 0 | 0 |
Investment restructuring | 0 | 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 | 1,068,000 | 2,600,000 |
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) | $ (1,664,000) | $ 208,000 |
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 | $ 5,833,000 | $ 0 |
New investments | 0 | 3,871,000 |
Investment restructuring | 0 | 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 | (4,776,000) | (81,000) |
Loan origination fees received | 0 | 0 |
Principal repayments received | 0 | 0 |
Fair value end of period | 1,581,000 | 3,819,000 |
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) | $ 2,467,000 | 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) | $ (1,943,000) | $ 29,000 |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net unrealized appreciation (depreciation) on investments |  |

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