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Investments - Investment Portfolio Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Total |  |
Fair value, beginning of period | $ 2,127,521 | $ 1,520,038
New investments | 568,446 | 1,089,028
Investments acquired in Sierra Merger |  | 271,490
Transfers into (out of) Level 3, net | 1,886 | 404
Proceeds from sales of investments | (259,205) | (352,940)
Loan origination fees received | (8,286) | (20,120)
Principal repayments received | (236,821) | (348,445)
Fair value, end of period | 2,237,531 | 2,127,521
Payment-in-kind interest/dividends |  |
Total |  |
Realized gain (loss) | $ 25,311 | $ 16,003
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 |  |
Total |  |
Realized gain (loss) | $ 1,584 | $ 879
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 |  |
Total |  |
Realized gain (loss) | $ 8,122 | $ 11,072
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) |  |
Total |  |
Realized gain (loss) | $ (46,340) | $ (15,608)
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) |  |
Total |  |
Realized gain (loss) | $ 55,313 | $ (44,280)
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 |  |
Total |  |
Fair value, beginning of period | $ 1,591,356 | $ 1,137,323
New investments | 396,040 | 907,398
Investments acquired in Sierra Merger |  | 210,176
Transfers into (out of) Level 3, net | (15,843) | 43
Proceeds from sales of investments | (246,902) | (323,831)
Loan origination fees received | (8,173) | (18,803)
Principal repayments received | (151,817) | (270,795)
Fair value, end of period | 1,593,797 | 1,591,356
Senior debt and 1st lien notes | Payment-in-kind interest/dividends |  |
Total |  |
Realized gain (loss) | $ 6,757 | $ 2,996
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 |  |
Total |  |
Realized gain (loss) | $ 668 | $ 790
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 |  |
Total |  |
Realized gain (loss) | $ 7,420 | $ 8,338
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) |  |
Total |  |
Realized gain (loss) | $ (1,746) | $ (13,163)
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) |  |
Total |  |
Realized gain (loss) | $ 16,037 | $ (49,116)
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 |  |
Total |  |
Fair value, beginning of period | $ 234,214 | $ 230,569
New investments | 49,525 | 95,157
Investments acquired in Sierra Merger |  | 54,177
Transfers into (out of) Level 3, net | 16,815 | (11,848)
Proceeds from sales of investments | (2,800) | (21,555)
Loan origination fees received | (113) | (1,317)
Principal repayments received | (83,986) | (77,293)
Fair value, end of period | 223,798 | 234,214
Subordinated debt and 2nd lien notes | Payment-in-kind interest/dividends |  |
Total |  |
Realized gain (loss) | $ 9,877 | $ 11,330
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 |  |
Total |  |
Realized gain (loss) | $ 916 | $ 89
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 |  |
Total |  |
Realized gain (loss) | $ 702 | $ 2,734
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) |  |
Total |  |
Realized gain (loss) | $ (43,902) | $ (2,781)
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) |  |
Total |  |
Realized gain (loss) | $ 42,550 | $ (45,048)
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 |  |
Total |  |
Fair value, beginning of period | $ 17,827 | $ 0
New investments | 28,286 | 14,893
Investments acquired in Sierra Merger |  | 0
Transfers into (out of) Level 3, net | 0 | 4,905
Proceeds from sales of investments | (526) | 0
Loan origination fees received | 0 | 0
Principal repayments received | (1,018) | (357)
Fair value, end of period | 42,972 | 17,827
Structured Products | Payment-in-kind interest/dividends |  |
Total |  |
Realized gain (loss) | $ 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 |  |
Total |  |
Realized gain (loss) | $ 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 |  |
Total |  |
Realized gain (loss) | $ 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) |  |
Total |  |
Realized gain (loss) | $ 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) |  |
Total |  |
Realized gain (loss) | $ (1,597) | $ (1,614)
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 |  |
Total |  |
Fair value, beginning of period | $ 283,067 | $ 151,282
New investments | 94,595 | 71,576
Investments acquired in Sierra Merger |  | 7,065
Transfers into (out of) Level 3, net | 914 | 7,263
Proceeds from sales of investments | (8,977) | (7,304)
Loan origination fees received | 0 | 0
Principal repayments received | 0 | 0
Fair value, end of period | 374,572 | 283,067
Equity shares | Payment-in-kind interest/dividends |  |
Total |  |
Realized gain (loss) | $ 8,677 | $ 1,677
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 |  |
Total |  |
Realized gain (loss) | $ 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 |  |
Total |  |
Realized gain (loss) | $ 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) |  |
Total |  |
Realized gain (loss) | $ (590) | $ 1,096
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) |  |
Total |  |
Realized gain (loss) | $ (3,114) | $ 50,412
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 |  |
Total |  |
Fair value, beginning of period | $ 1,057 | $ 864
New investments | 0 | 4
Investments acquired in Sierra Merger |  | 72
Transfers into (out of) Level 3, net | 0 | 41
Proceeds from sales of investments | 0 | (250)
Loan origination fees received | 0 | 0
Principal repayments received | 0 | 0
Fair value, end of period | 2,392 | 1,057
Equity warrants | Payment-in-kind interest/dividends |  |
Total |  |
Realized gain (loss) | $ 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 |  |
Total |  |
Realized gain (loss) | $ 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 |  |
Total |  |
Realized gain (loss) | $ 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) |  |
Total |  |
Realized gain (loss) | $ (102) | $ (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) |  |
Total |  |
Realized gain (loss) | $ 1,437 | $ 1,086
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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