Agreements and Related Party Transactions (Details) $ in Thousands																										3 Months Ended		6 Months Ended
	Jun. 20, 2023 USD ($)	Jun. 13, 2023 USD ($)	Jun. 01, 2023 USD ($)	May 03, 2023 USD ($)	Mar. 16, 2023 USD ($)	Feb. 28, 2023 USD ($)	Feb. 24, 2023 USD ($)	Feb. 17, 2023 USD ($)	Feb. 09, 2023 USD ($)	Dec. 14, 2022 USD ($)	Nov. 29, 2022 USD ($)	Nov. 15, 2022 USD ($)	Nov. 09, 2022 USD ($)	Oct. 17, 2022 USD ($)	Jul. 18, 2022 USD ($)	Jul. 01, 2022 USD ($)	May 21, 2022 USD ($)	May 03, 2022 component	Feb. 28, 2022 USD ($)	Aug. 19, 2021 USD ($)	May 18, 2021	Mar. 08, 2021 USD ($)	Jul. 31, 2020 USD ($)	Mar. 25, 2020 USD ($)	Sep. 24, 2019 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Related Party Transaction [Line Items]
Management fees																										$ 48,024	$ 46,873	$ 96,116	$ 94,286
Performance based incentive fees																										39,598	26,541	77,326	52,495
Affiliated entity | Administration Agreement
Related Party Transaction [Line Items]
Contract term																					2 years
Written notice for contract termination, term																		60 days
Affiliated entity | Administration Agreement, Costs And Expenses Reimbursable
Related Party Transaction [Line Items]
Amount of transaction																										2,000	1,400	3,900	2,900
Affiliated entity | Investment Advisory Agreement
Related Party Transaction [Line Items]
Contract term																					2 years
Written notice for contract termination, term																		60 days
Required term of written notice for contract termination for certain circumstances																		120 days
Incentive fee components | component																		2
Affiliated entity | Investment Advisory Agreement, Management Fee - Average Gross Assets
Related Party Transaction [Line Items]
Base rate																		1.50%
Affiliated entity | Investment Advisory Agreement, Management Fee - Asset Coverage Ratio Threshold
Related Party Transaction [Line Items]
Base rate																		200.00%
Affiliated entity | Investment Advisory Agreement, Management Fee - Average Gross Assets Below Asset Coverage Ratio
Related Party Transaction [Line Items]
Base rate																		1.00%
Affiliated entity | Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income
Related Party Transaction [Line Items]
Incentive rate																		100.00%
Affiliated entity | Investment Management Agreement - Incentive Rate, Quarterly Hurdle Rate
Related Party Transaction [Line Items]
Incentive rate																		1.50%
Affiliated entity | Investment Management Agreement - Incentive Rate, Realized Capital Gains
Related Party Transaction [Line Items]
Incentive rate																		17.50%
Affiliated entity | Investment Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Threshold
Related Party Transaction [Line Items]
Incentive rate																		17.50%
Affiliated entity | Investment Advisory Agreement - Incentive Rate, Quarterly Threshold
Related Party Transaction [Line Items]
Incentive rate																		1.82%
Affiliated entity | Management Fee
Related Party Transaction [Line Items]
Management fees																										48,000	46,900	96,100	94,300
Affiliated entity | Performance Based Incentive Fee
Related Party Transaction [Line Items]
Performance based incentive fees																										$ 39,600	$ 26,500	$ 77,300	$ 52,500
Affiliated entity | Commitment To Indirectly Owned Subsidiary
Related Party Transaction [Line Items]
Amount of transaction						$ 450,000											$ 400,000		$ 350,000	$ 250,000		$ 200,000	$ 150,000	$ 100,000	$ 50,000
Affiliated entity | Equity Commitment To Amergin AssetCo
Related Party Transaction [Line Items]
Amount of transaction																$ 90,000
Affiliated entity | Equity Commitment To Fifth Season
Related Party Transaction [Line Items]
Amount of transaction	$ 3,500	$ 3,500	$ 3,500	$ 5,300	$ 11,900		$ 300	$ 2,800	$ 5,300		$ 7,000	$ 7,300	$ 1,700	$ 73,600	$ 15,900
Affiliated entity | Equity Commitment To LSI Financing
Related Party Transaction [Line Items]
Amount of transaction										$ 6,200