Commitments and Contingencies - Summary of Payments Due by Period (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commitments And Contingencies [LineItems]
Borrowings	$ 519,250,000	$ 559,250,000	$ 81,000,000	$ 99,000,000	$ 61,000,000	$ 59,500,000	$ 0
Borrowings, 1-3 years	367,000,000
Borrowings, 3-5 years	152,250,000	559,250,000
Deferred Incentive Fees	12,500,000	8,808,000
Deferred Incentive Fees, Less than 1 Year	2,567,000	674,000
Deferred Incentive Fees, 1-3 years	3,919,000	1,760,000
Deferred Incentive Fees, 3-5 years	2,548,000	1,023,000
Deferred Incentive Fees, More than 5 Years	131,000	1,552,000
Commitments	528,415,000	564,259,000
Commitments, Less than 1 Year	2,567,000	674,000
Commitments, 1-3 years	370,919,000	1,760,000
Commitments, 3-5 years	154,798,000	560,273,000
Commitments, More than 5 Years	131,000	1,552,000
Unsecured Debt | 2026 Notes
Commitments And Contingencies [LineItems]
Borrowings	95,000,000	70,000,000
Borrowings, 1-3 years	95,000,000
Borrowings, 3-5 years		70,000,000
Unsecured Debt | 2027 Notes
Commitments And Contingencies [LineItems]
Borrowings	152,250,000	152,250,000
Borrowings, 3-5 years	152,250,000	152,250,000
Credit Facility
Commitments And Contingencies [LineItems]
Borrowings	272,000,000	337,000,000	$ 61,000,000	$ 99,000,000	$ 61,000,000
Borrowings, 1-3 years	272,000,000
Borrowings, 3-5 years		337,000,000
Deferred Payments | Advisory Agreement
Commitments And Contingencies [LineItems]
Deferred Incentive Fees	9,165,000	5,009,000
Borrowings
Commitments And Contingencies [LineItems]
Borrowings	519,250,000	559,250,000
Borrowings | Credit Facility
Commitments And Contingencies [LineItems]
Borrowings	$ 272,000,000	$ 337,000,000