Fair Value Measurement - Summary of Reconciliation of Level 3 Assets (Details) - Level 3 - USD ($)		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 154,024,000	$ 112,056,000
Net Transfers In/Out		(6,311,000)	0
Purchases	[1]	78,999,000	143,441,000
Net Realized Gain (Loss)		$ (129,591,000)	(15,343,000)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Realized Investment Gains Losses
Net Change in Unrealized Appreciation (Depreciation)	[2]	$ 106,801,000	(14,637,000)
Sales and Settlements	[1]	(67,988,000)	(74,583,000)
Net Amortization of Premium/ Discount		443,000	3,090,000
Ending Balance		136,377,000	154,024,000
Debt
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance		104,936,000	85,865,000
Net Transfers In/Out		(6,311,000)
Purchases	[1]	66,461,000	118,965,000
Net Realized Gain (Loss)		(60,207,000)	(13,067,000)
Net Change in Unrealized Appreciation (Depreciation)	[2]	45,325,000	(19,544,000)
Sales and Settlements	[1]	(46,314,000)	(70,373,000)
Net Amortization of Premium/ Discount		443,000	3,090,000
Ending Balance		104,333,000	104,936,000
Equity/Other
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance		49,088,000	26,191,000
Purchases	[1]	12,538,000	24,476,000
Net Realized Gain (Loss)		(69,384,000)	(2,276,000)
Net Change in Unrealized Appreciation (Depreciation)	[2]	61,476,000	4,907,000
Sales and Settlements	[1]	(21,674,000)	(4,210,000)
Ending Balance		$ 32,044,000	$ 49,088,000

[1] Purchases may include new deals, additional fundings (inclusive of those on revolving credit facilities), refinancings, capitalized PIK income, and securities received in corporate actions and restructurings. Sales and Settlements may include scheduled principal payments, prepayments, sales and repayments (inclusive of those on revolving credit facilities), and securities delivered in corporate actions and restructuring of investments.

[2] The net change in unrealized appreciation/(depreciation) relating to Level 3 assets still held at December 31, 2022 totaled $(19,811) consisting of the following: $(11,792) related to debt investments and $(8,019) related to equity/other. The net change in unrealized depreciation relating to Level 3 assets still held at December 31, 2021 totaled $(27,528) consisting of the following: $(31,826) related to debt investments and $4,298 related to equity/other.