Fair Value of Financial Instruments - Summary of Reconciliation of Investments that Use Level 3 Inputs (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 1,470,147	$ 1,167,987
Amortized discounts/premiums	4,406	3,107
Paid in-kind interest	4,131	1,715
Net realized gain (loss)	$ (4,954)	$ (5,705)
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)	$ 8,063	$ 7,488
Purchases	194,723	372,104
Sales/return of capital/principal repayments/paydowns	(150,116)	(102,812)
Transfers in	2,522	48,506
Transfers out	(3,330)	(23,855)
Ending balance	1,525,592	1,468,535
Net change in unrealized appreciation (depreciation) from investments still held	8,063	1,075
Senior Secured First Lien
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	409,945	277,786
Amortized discounts/premiums	1,133	720
Paid in-kind interest	1,150	466
Net realized gain (loss)	$ (4,096)	$ (5,459)
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)	$ (1,106)	$ 4,248
Purchases	63,953	210,934
Sales/return of capital/principal repayments/paydowns	(40,619)	(65,208)
Transfers in	2,546	1,664
Transfers out		(18,960)
Ending balance	432,906	406,191
Net change in unrealized appreciation (depreciation) from investments still held	(1,106)	(2,313)
Unitranche First Lien
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	948,781	771,348
Amortized discounts/premiums	3,052	2,246
Paid in-kind interest	1,180	218
Net realized gain (loss)	$ (228)	$ (17)
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)	$ 3,794	$ 418
Purchases	117,719	157,263
Sales/return of capital/principal repayments/paydowns	(94,008)	(32,107)
Transfers in	(24)	46,842
Ending balance	980,266	946,211
Net change in unrealized appreciation (depreciation) from investments still held	3,794	418
Unitranche First Last Out
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	13,544	13,827
Amortized discounts/premiums	88	15
Paid in-kind interest	398	334
Net realized gain (loss)	$ (2,308)
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)	$ 2,251	107
Purchases		3
Sales/return of capital/principal repayments/paydowns	(8,369)
Ending balance	5,604	14,286
Net change in unrealized appreciation (depreciation) from investments still held	2,251	106
Senior Secured Second Lien
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	44,907	56,586
Amortized discounts/premiums	129	122
Paid in-kind interest	984	328
Net realized gain (loss)		(470)
Net change in unrealized appreciation (depreciation)	(2,053)	1,249
Purchases		(35)
Sales/return of capital/principal repayments/paydowns	(5,429)	(4,500)
Transfers out	(3,330)	(4,500)
Ending balance	35,208	48,780
Net change in unrealized appreciation (depreciation) from investments still held	(2,053)	358
Unsecured Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	4,061	4,533
Amortized discounts/premiums	4	4
Paid in-kind interest	419	369
Net change in unrealized appreciation (depreciation)	808	13
Purchases	10,341	676
Ending balance	15,633	5,595
Net change in unrealized appreciation (depreciation) from investments still held	808	13
Equity & Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	48,909	43,907
Net realized gain (loss)	$ 1,678	241
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)	$ 4,369	1,453
Purchases	2,710	3,263
Sales/return of capital/principal repayments/paydowns	(1,691)	(997)
Transfers out		(395)
Ending balance	55,975	47,472
Net change in unrealized appreciation (depreciation) from investments still held	$ 4,369	$ 2,493