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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, 2022	Dec. 31, 2021
Total
Fair value, beginning of period	$ 1,520,038	$ 1,231,898
New investments	1,089,028	1,351,043
Investments acquired in Sierra merger	271,490
Transfers into (out of) Level 3, net	404	2,828
Proceeds from sales of investments	(352,940)	(758,772)
Loan origination fees received	(20,120)	(30,504)
Principal repayments received	(348,445)	(287,346)
Fair value, end of period	2,127,521	1,520,038
Payment-in-kind interest/dividends
Total
Realized gain (loss)	$ 16,003	$ 9,369
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 deferred loan origination revenue
Total
Realized gain (loss)	$ 11,072	$ 9,187
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 loan premium/discount
Total
Realized gain (loss)	$ 879	$ 238
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)	$ (15,608)	$ 501
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)	$ (44,280)	$ (8,404)
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	$ 1,137,323	$ 1,055,717
New investments	907,398	1,096,053
Investments acquired in Sierra merger	210,176
Transfers into (out of) Level 3, net	43	(2,630)
Proceeds from sales of investments	(323,831)	(736,675)
Loan origination fees received	(18,803)	(26,844)
Principal repayments received	(270,795)	(255,215)
Fair value, end of period	1,591,356	1,137,323
Senior debt and 1st lien notes | Payment-in-kind interest/dividends
Total
Realized gain (loss)	$ 2,996	$ 865
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 deferred loan origination revenue
Total
Realized gain (loss)	$ 8,338	$ 8,584
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 loan premium/discount
Total
Realized gain (loss)	$ 790	$ 16
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)	$ (13,163)	$ (575)
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)	$ (49,116)	$ (1,973)
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	$ 230,569	$ 130,820
New investments	95,157	151,301
Investments acquired in Sierra merger	54,177
Transfers into (out of) Level 3, net	(11,848)	2,234
Proceeds from sales of investments	(21,555)	(13,683)
Loan origination fees received	(1,317)	(3,660)
Principal repayments received	(77,293)	(32,131)
Fair value, end of period	234,214	230,569
Subordinated debt and 2nd lien notes | Payment-in-kind interest/dividends
Total
Realized gain (loss)	$ 11,330	$ 8,504
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 deferred loan origination revenue
Total
Realized gain (loss)	$ 2,734	$ 603
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 loan premium/discount
Total
Realized gain (loss)	$ 89	$ 222
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)	$ (2,781)	$ (37)
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)	$ (45,048)	$ (13,604)
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	$ 0
New investments	14,893
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	17,827	$ 0
Structured Products | Payment-in-kind interest/dividends
Total
Realized gain (loss)	$ 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 deferred loan origination revenue
Total
Realized gain (loss)	$ 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 loan premium/discount
Total
Realized gain (loss)	$ 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
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)	$ (1,614)
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	$ 151,282	$ 44,227
New investments	71,576	103,526
Investments acquired in Sierra merger	7,065
Transfers into (out of) Level 3, net	7,263	3,224
Proceeds from sales of investments	(7,304)	(7,964)
Loan origination fees received	0	0
Principal repayments received	0	0
Fair value, end of period	283,067	151,282
Equity shares | Payment-in-kind interest/dividends
Total
Realized gain (loss)	$ 1,677	$ 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 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 | 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 | Realized gain (loss)
Total
Realized gain (loss)	$ 1,096	$ 950
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)	$ 50,412	$ 7,319
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	$ 864	$ 1,134
New investments	4	163
Investments acquired in Sierra merger	72
Transfers into (out of) Level 3, net	41	0
Proceeds from sales of investments	(250)	(450)
Loan origination fees received	0	0
Principal repayments received	0	0
Fair value, end of period	1,057	864
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 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 | 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 | Realized gain (loss)
Total
Realized gain (loss)	$ (760)	$ 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
Equity warrants | Unrealized appreciation (depreciation)
Total
Realized gain (loss)	$ 1,086	$ (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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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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