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Fair Value of Financial Instruments - Summary of Changes In Fair Value of Company's Level 3 Debt (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, Beginning balance	$ 1,270,869	$ 1,095,504
Purchases, net of deferred fees	239,975	627,199
Non-cash conversions		21
Transfers into/(out of) of Level 3	(28,316)	(7)
Proceeds from sales and paydowns	(140,206)	(471,926)
Accretion of OID, EOT, and PIK payments	7,172	32,953
Net realized gain/(loss)	$ 4,277	$ (28,071)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized Investment Gains Losses	Realized Investment Gains Losses
Net change in unrealized appreciation/(depreciation)	$ (7,047)	$ 15,196
Fair Value, Ending balance	1,346,724	1,270,869
Net change in unrealized appreciation/depreciation on Level 3 investments still held	(4,963)	(17,908)
Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, Beginning balance	1,222,077	1,048,829
Purchases, net of deferred fees	235,447	613,853
Non-cash conversions		(500)
Transfers into/(out of) of Level 3	(28,316)
Proceeds from sales and paydowns	(139,892)	(468,760)
Accretion of OID, EOT, and PIK payments	7,172	32,953
Net realized gain/(loss)	4,277	(15,292)
Net change in unrealized appreciation/(depreciation)	(12,374)	10,994
Fair Value, Ending balance	1,288,391	1,222,077
Net change in unrealized appreciation/depreciation on Level 3 investments still held	(10,290)	(8,420)
Equity
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, Beginning balance	15,150	13,245
Purchases, net of deferred fees	1,100	4,676
Non-cash conversions	7	538
Proceeds from sales and paydowns		(461)
Net realized gain/(loss)		(13,546)
Net change in unrealized appreciation/(depreciation)	1,068	10,698
Fair Value, Ending balance	17,325	15,150
Net change in unrealized appreciation/depreciation on Level 3 investments still held	1,068	(2,501)
Warrants
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, Beginning balance	31,201	30,989
Purchases, net of deferred fees	3,428	8,670
Non-cash conversions	(7)	(17)
Transfers into/(out of) of Level 3		(7)
Proceeds from sales and paydowns	(314)	(2,705)
Net realized gain/(loss)		767
Net change in unrealized appreciation/(depreciation)	4,259	(6,496)
Fair Value, Ending balance	38,567	31,201
Net change in unrealized appreciation/depreciation on Level 3 investments still held	4,259	(6,987)
Escrow Receivable
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, Beginning balance	2,441	2,441
Fair Value, Ending balance	$ 2,441	$ 2,441

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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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