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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value beginning of period | $ 2,237,531 | $ 2,127,521
New investments | 141,053 | 143,714
Investment restructuring | (22,249) |
Transfers into (out of) Level 3, net | (7,425) | (9,898)
Proceeds from sales of investments | (187) | (4,526)
Loan origination fees received | (2,519) | (2,420)
Principal repayments received | (89,648) | (37,428)
Fair value end of period | 2,266,459 | 2,232,251
Payment-in-kind interest/dividends |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value recurring basis gain (losses) | $ 4,346 | $ 3,619
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) | $ 161 | $ 173
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) | $ 2,399 | $ 1,948
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) | $ (12,641) | $ 684
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) | $ 15,638 | $ 8,864
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 | $ 1,593,797 | $ 1,591,356
New investments | 117,843 | 86,805
Investment restructuring | (22,249) |
Transfers into (out of) Level 3, net | (2,596) | (9,898)
Proceeds from sales of investments | (187) | (326)
Loan origination fees received | (2,238) | (2,397)
Principal repayments received | (78,200) | (25,486)
Fair value end of period | 1,595,417 | 1,650,361
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) | $ 921 | $ 1,170
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) | $ 134 | $ 132
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) | $ 2,266 | $ 1,787
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) | $ (7,528) | $ (274)
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) | $ (6,546) | $ 7,492
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 | $ 223,798 | $ 234,214
New investments | 18,330 | 769
Investment restructuring | 0 |
Transfers into (out of) Level 3, net | 0 | 0
Proceeds from sales of investments | 0 | 0
Loan origination fees received | (281) | (23)
Principal repayments received | (11,091) | (11,575)
Fair value end of period | 232,208 | 225,734
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) | $ 1,363 | $ 2,449
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) | $ 27 | $ 41
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) | $ 133 | $ 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
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) | $ (5,107) | $ 5
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) | $ 5,036 | $ (307)
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 | $ 42,972 | $ 17,827
New investments | 49 | 9,382
Investment restructuring | 0 |
Transfers into (out of) Level 3, net | 0 | 0
Proceeds from sales of investments | 0 | 0
Loan origination fees received | 0 | 0
Principal repayments received | (357) | (367)
Fair value end of period | 45,209 | 26,116
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) | $ 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 | Realized gain (loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value recurring basis gain (losses) | $ (6) | $ 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 products | Unrealized appreciation (depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value recurring basis gain (losses) | $ 2,551 | $ (726)
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 | $ 374,572 | $ 283,067
New investments | 4,831 | 46,758
Investment restructuring | 0 |
Transfers into (out of) Level 3, net | (4,829) | 0
Proceeds from sales of investments | 0 | (4,200)
Loan origination fees received | 0 | 0
Principal repayments received | 0 | 0
Fair value end of period | 391,116 | 328,984
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) | $ 2,062 | $ 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 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) | $ 0 | $ 953
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) | $ 14,480 | $ 2,406
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 | $ 2,392 | $ 1,057
New investments | 0 | 0
Investment restructuring | 0 |
Transfers into (out of) Level 3, net | 0 | 0
Proceeds from sales of investments | 0 | 0
Loan origination fees received | 0 | 0
Principal repayments received | 0 | 0
Fair value end of period | 2,509 | 1,056
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) | $ 117 | $ (1)
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

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Loan Origination Fees Received + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Principal Repayment Received + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Reclassification + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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