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INVESTMENTS - Investment Portfolio Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of period | $ 1,520,038 | $ 1,231,898
New investments | 848,735 | 765,524
Investments acquired in Sierra merger | 271,490 |
Transfers into (out of) Level 3, net | 39,239 | 5,458
Proceeds from sales of investments | (345,035) | (410,951)
Loan origination fees received | (15,963) | (13,694)
Principal repayments received | (263,826) | (198,264)
Fair value, end of period | 2,019,381 | 1,397,568
Paid In Kind Interest/Dividends |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 11,520 | 8,406
Accretion Of Deferred Loan Origination Revenue |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 8,335 | 6,405
Accretion Of Loan Premium/Discount |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 311 | 221
Gain (Loss) on Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | (15,601) | 2,313
Unrealized Appreciation (Depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | (39,862) | 252
Senior debt and 1st lien notes |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of period | 1,137,323 | 1,055,717
New investments | 689,638 | 585,196
Investments acquired in Sierra merger | 210,176 |
Transfers into (out of) Level 3, net | 18,015 | 0
Proceeds from sales of investments | (321,758) | (394,827)
Loan origination fees received | (14,660) | (12,485)
Principal repayments received | (207,026) | (170,947)
Fair value, end of period | 1,462,413 | 1,069,751
Senior debt and 1st lien notes | Paid In Kind Interest/Dividends |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 1,994 | 685
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] |  |
Realized gain (loss) | 6,574 | 6,029
Senior debt and 1st lien notes | Accretion Of Loan Premium/Discount |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 222 | 10
Senior debt and 1st lien notes | Gain (Loss) on Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | (12,292) | 1,837
Senior debt and 1st lien notes | Unrealized Appreciation (Depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | (45,793) | (1,464)
Subordinated debt and 2nd lien notes |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of period | 230,569 | 130,820
New investments | 89,749 | 83,856
Investments acquired in Sierra merger | 54,177 |
Transfers into (out of) Level 3, net | 9,056 | 2,234
Proceeds from sales of investments | (21,555) | (8,771)
Loan origination fees received | (1,303) | (1,209)
Principal repayments received | (56,443) | (27,317)
Fair value, end of period | 269,995 | 185,247
Subordinated debt and 2nd lien notes | Paid In Kind Interest/Dividends |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 9,320 | 7,721
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] |  |
Realized gain (loss) | 1,761 | 376
Subordinated debt and 2nd lien notes | Accretion Of Loan Premium/Discount |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 89 | 211
Subordinated debt and 2nd lien notes | Gain (Loss) on Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | (2,567) | (28)
Subordinated debt and 2nd lien notes | Unrealized Appreciation (Depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | (42,858) | (2,646)
Structured products |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of period | 0 |
New investments | 6,000 |
Investments acquired in Sierra merger | 0 |
Transfers into (out of) Level 3, net | 4,905 |
Proceeds from sales of investments | 0 |
Loan origination fees received | 0 |
Principal repayments received | (357) |
Fair value, end of period | 9,482 |
Structured products | Paid In Kind Interest/Dividends |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 0 |
Structured products | Accretion Of Deferred Loan Origination Revenue |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 0 |
Structured products | Accretion Of Loan Premium/Discount |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 0 |
Structured products | Gain (Loss) on Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 0 |
Structured products | Unrealized Appreciation (Depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | (1,066) |
Equity shares |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of period | 151,282 | 44,227
New investments | 63,344 | 96,309
Investments acquired in Sierra merger | 7,065 |
Transfers into (out of) Level 3, net | 7,263 | 3,224
Proceeds from sales of investments | (1,472) | (6,903)
Loan origination fees received | 0 | 0
Principal repayments received | 0 | 0
Fair value, end of period | 277,488 | 141,946
Equity shares | Paid In Kind Interest/Dividends |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 206 | 0
Equity shares | Accretion Of Deferred Loan Origination Revenue |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 0 | 0
Equity shares | Accretion Of Loan Premium/Discount |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 0 | 0
Equity shares | Gain (Loss) on Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 18 | 341
Equity shares | Unrealized Appreciation (Depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 49,782 | 4,748
Equity warrants |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of period | 864 | 1,134
New investments | 4 | 163
Investments acquired in Sierra merger | 72 |
Transfers into (out of) Level 3, net | 0 | 0
Proceeds from sales of investments | (250) | (450)
Loan origination fees received | 0 | 0
Principal repayments received | 0 | 0
Fair value, end of period | 3 | 624
Equity warrants | Paid In Kind Interest/Dividends |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 0 | 0
Equity warrants | Accretion Of Deferred Loan Origination Revenue |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 0 | 0
Equity warrants | Accretion Of Loan Premium/Discount |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | 0 | 0
Equity warrants | Gain (Loss) on Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | (760) | 163
Equity warrants | Unrealized Appreciation (Depreciation) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Realized gain (loss) | $ 73 | $ (386)

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