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INVESTMENTS - Investment Portfolio Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 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 | 143,714 | 300,442
Investments acquired in Sierra merger |  | 271,490
Transfers into (out of) Level 3, net | (9,898) | 7,485
Proceeds from sales of investments | (4,526) | (153,194)
Loan origination fees received | (2,420) | (5,314)
Principal repayments received | (37,428) | (18,793)
Fair value end of period | 2,232,251 | 1,950,908
Payment-in-kind interest/dividends |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value recurring basis gain (losses) | $ 3,619 | $ 7,292
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) | $ 173 | $ 17
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) | $ 1,948 | $ 1,452
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) | $ 684 | $ (141)
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) | $ 8,864 | $ 20,134
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 | 86,805 | 258,441
Investments acquired in Sierra merger |  | 210,176
Transfers into (out of) Level 3, net | (9,898) | 2,580
Proceeds from sales of investments | (326) | (151,580)
Loan origination fees received | (2,397) | (5,350)
Principal repayments received | (25,486) | (7,773)
Fair value end of period | 1,650,361 | 1,440,531
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) | $ 1,170 | $ 308
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) | $ 132 | $ 7
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) | $ 1,787 | $ 1,390
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) | $ (274) | $ 611
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) | $ 7,492 | $ (5,602)
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 | 769 | 30,065
Investments acquired in Sierra merger |  | 54,177
Transfers into (out of) Level 3, net | 0 | 0
Proceeds from sales of investments | 0 | 0
Loan origination fees received | (23) | 36
Principal repayments received | (11,575) | (11,020)
Fair value end of period | 225,734 | 295,997
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) | $ 2,449 | $ 6,984
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) | $ 41 | $ 10
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) | $ 161 | $ 62
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 | $ 8
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) | $ (307) | $ (14,894)
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 | 9,382 | 0
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 | 26,116 | 4,986
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) | $ (726) | $ 81
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 | 46,758 | 11,936
Investments acquired in Sierra merger |  | 7,065
Transfers into (out of) Level 3, net | 0 | 0
Proceeds from sales of investments | (4,200) | (1,364)
Loan origination fees received | 0 | 0
Principal repayments received | 0 | 0
Fair value end of period | 328,984 | 209,322
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) | $ 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 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 | $ 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) | $ 2,406 | $ 40,403
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | 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 | 1,056 | 72
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) | $ (1) | $ 146
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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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