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INVESTMENTS - Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value beginning of period | $ 2,127,521 | $ 1,520,038
New investments | 216,828 | 642,111
Investments acquired in Sierra merger |  | 271,490
Transfers into (out of) Level 3, net | (16,251) | 6,114
Proceeds from sales of investments | (75,425) | (237,068)
Loan origination fees received | (2,876) | (11,492)
Principal repayments received | (91,809) | (179,997)
Fair value end of period | 2,192,433 | 2,008,316
Payment-in-kind interest/dividends |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value recurring basis gain (losses) | $ 12,207 | $ 9,924
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) | $ 685 | $ 110
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) | $ 3,953 | $ 5,152
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) | $ (43,610) | $ (7,577)
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) | $ 61,210 | $ (10,489)
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 | $ 1,591,356 | $ 1,137,323
New investments | 131,734 | 510,243
Investments acquired in Sierra merger |  | 210,176
Transfers into (out of) Level 3, net | (9,417) | (6,054)
Proceeds from sales of investments | (68,425) | (220,592)
Loan origination fees received | (2,825) | (10,371)
Principal repayments received | (59,097) | (157,387)
Fair value end of period | 1,596,129 | 1,437,934
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) | $ 2,309 | $ 985
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) | $ 259 | $ 74
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) | $ 3,672 | $ 4,178
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) | $ (661) | $ (5,329)
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) | $ 7,224 | $ (25,312)
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 | $ 234,214 | $ 230,569
New investments | 11,478 | 80,752
Investments acquired in Sierra merger |  | 54,177
Transfers into (out of) Level 3, net | (7,748) | 0
Proceeds from sales of investments | (2,800) | (14,754)
Loan origination fees received | (51) | (1,121)
Principal repayments received | (32,345) | (22,610)
Fair value end of period | 209,090 | 295,582
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) | $ 6,187 | $ 8,939
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) | $ 426 | $ 36
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) | $ 281 | $ 974
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) | $ (43,902) | $ (1,506)
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) | $ 43,350 | $ (39,874)
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 | $ 17,827 | $ 0
New investments | 13,479 | 6,000
Investments acquired in Sierra merger |  | 0
Transfers into (out of) Level 3, net | 0 | 4,905
Proceeds from sales of investments | 0 | 0
Loan origination fees received | 0 | 0
Principal repayments received | (367) | 0
Fair value end of period | 30,895 | 10,434
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) | $ 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
Structured products | Unrealized appreciation (depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value recurring basis gain (losses) | $ (44) | $ (471)
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 | $ 283,067 | $ 151,282
New investments | 60,137 | 45,116
Investments acquired in Sierra merger |  | 7,065
Transfers into (out of) Level 3, net | 914 | 7,263
Proceeds from sales of investments | (4,200) | (1,472)
Loan origination fees received | 0 | 0
Principal repayments received | 0 | 0
Fair value end of period | 355,175 | 264,331
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) | $ 3,711 | $ 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) | $ 953 | $ 18
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) | $ 10,593 | $ 55,059
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 | $ 1,057 | $ 864
New investments | 0 | 0
Investments acquired in Sierra merger |  | 72
Transfers into (out of) Level 3, net | 0 | 0
Proceeds from sales of investments | 0 | (250)
Loan origination fees received | 0 | 0
Principal repayments received | 0 | 0
Fair value end of period | 1,144 | 35
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 | $ (760)
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) | $ 87 | $ 109
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 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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