Fair Value of Financial Instruments - Summary of Reconciliation of Investments that Use Level 3 Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 1,167,987	$ 1,105,680
Amortized discounts/premiums	7,237	6,561
Paid in-kind interest	3,751	4,455
Net realized gain (loss)	$ (14,009)	$ 8,224
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Investments	Gain (Loss) on Investments
Net change in unrealized appreciation (depreciation)	$ 22,468	$ (49,394)
Purchases	520,610	298,215
Sales/return of capital/principal repayments/paydowns	(258,084)	(211,562)
Transfers in	33,785	36,007
Transfers out	(13,598)	(30,199)
Ending balance	1,470,147	1,167,987
Net change in unrealized appreciation (depreciation) from investments still held	(10,750)	(46,892)
Senior Secured First Lien
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	277,786	268,851
Amortized discounts/premiums	1,883	1,281
Paid in-kind interest	1,249	707
Net realized gain (loss)	$ (5,459)	$ (304)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Investments	Gain (Loss) on Investments
Net change in unrealized appreciation (depreciation)	$ 3,889	$ (2,092)
Purchases	263,869	70,925
Sales/return of capital/principal repayments/paydowns	(134,936)	(81,880)
Transfers in	1,664	20,298
Ending balance	409,945	277,786
Net change in unrealized appreciation (depreciation) from investments still held	(2,813)	(2,815)
Unitranche First Lien
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	771,348	711,296
Amortized discounts/premiums	5,102	4,818
Paid in-kind interest	554	56
Net realized gain (loss)	$ (8,566)	$ (30)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Investments	Gain (Loss) on Investments
Net change in unrealized appreciation (depreciation)	$ (15,911)	$ (28,701)
Purchases	247,512	215,410
Sales/return of capital/principal repayments/paydowns	(111,140)	(101,591)
Transfers in	28,060
Transfers out		(29,910)
Ending balance	948,781	771,348
Net change in unrealized appreciation (depreciation) from investments still held	(10,833)	(27,063)
Unitranche First Last Out
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	13,827	13,723
Amortized discounts/premiums	36	30
Paid in-kind interest	709	334
Net change in unrealized appreciation (depreciation)	(1,031)	924
Purchases	3	3,964
Sales/return of capital/principal repayments/paydowns		(5,148)
Ending balance	13,544	13,827
Net change in unrealized appreciation (depreciation) from investments still held	(1,031)	924
Senior Secured Second Lien
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	56,586	47,584
Amortized discounts/premiums	159	347
Paid in-kind interest	469	785
Net realized gain (loss)	$ (470)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Investments
Net change in unrealized appreciation (depreciation)	$ 1,867	(5,946)
Purchases	3,240	2,703
Sales/return of capital/principal repayments/paydowns	(7,775)	(4,307)
Transfers in	4,061	15,709
Transfers out	(13,230)	(289)
Ending balance	44,907	56,586
Net change in unrealized appreciation (depreciation) from investments still held	976	(5,894)
Unsecured Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	4,533	5,620
Amortized discounts/premiums	57	85
Paid in-kind interest	770	575
Net realized gain (loss)	(165)
Net change in unrealized appreciation (depreciation)	597	(496)
Purchases	919	681
Sales/return of capital/principal repayments/paydowns	2,650	(1,932)
Ending balance	4,061	4,533
Net change in unrealized appreciation (depreciation) from investments still held	509	(535)
Equity & Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	43,907	58,606
Paid in-kind interest		1,998
Net realized gain (loss)	$ 651	$ 8,558
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Investments	Gain (Loss) on Investments
Net change in unrealized appreciation (depreciation)	$ 1,235	$ (13,083)
Purchases	5,067	4,532
Sales/return of capital/principal repayments/paydowns	(1,583)	(16,704)
Transfers out	(368)
Ending balance	48,909	43,907
Net change in unrealized appreciation (depreciation) from investments still held	$ 2,275	$ (11,509)