Debt - Schedule of Debt (Details) - USD ($)		Dec. 31, 2022	Dec. 31, 2021	Oct. 27, 2021	Mar. 28, 2016
Debt Instrument [Line Items]
Aggregate Principal Amount Committed		$ 885,000,000	$ 835,000,000
Drawn Amount	[1],[2]	659,836,000	637,937,000
Amount Available	[3]	225,164,000	197,063,000
SPV Asset Facility
Debt Instrument [Line Items]
Aggregate Principal Amount Committed		350,000,000	350,000,000		$ 350,000,000
Drawn Amount	[1],[2]	233,000,000	249,500,000
Amount Available	[3]	117,000,000	100,500,000
SMBC Corporate Revolving Facility
Debt Instrument [Line Items]
Aggregate Principal Amount Committed		350,000,000	300,000,000	$ 350,000,000
Drawn Amount	[1],[2]	241,836,000	203,437,000
Amount Available	[3]	108,164,000	96,563,000
2023 Unsecured Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Committed		50,000,000	50,000,000
Drawn Amount	[1],[2]	50,000,000	50,000,000
2026 Unsecured Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Committed	[4]	135,000,000	135,000,000
Drawn Amount	[1],[2],[4]	$ 135,000,000	$ 135,000,000

[1] As of December 31, 2022 and 2021, the carrying amount of the Company’s outstanding debt approximated fair value, unless otherwise noted.

[2] The amount presented excludes netting of deferred financing costs.

[3] The amount available is subject to any limitations related to the respective debt facilities’ borrowing bases and foreign currency translation adjustments.

[4] As of December 31, 2022, the fair value of the 2026 Unsecured Notes was approximately $123,223.