Debt and Foreign Currency Transactions and Translations - Schedule of Foreign Denominated Debt Outstanding (Details) € in Thousands, £ in Thousands, kr in Thousands, $ in Thousands, $ in Thousands	Sep. 30, 2023 GBP (£)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 EUR (€)	Dec. 31, 2022 GBP (£)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)	Dec. 31, 2022 AUD ($)	Dec. 31, 2022 SEK (kr)
Senior Secured Facility and SPV Financing Facilities
Debt Instrument [Line Items]
Original Principal Amount		$ 390,410			$ 397,989
Principal Amount Outstanding		395,706			410,188
Unrealized Gain/(Loss)		(5,296)			(12,199)
Senior Secured Facility and SPV Financing Facilities One | British Pound
Debt Instrument [Line Items]
Original Principal Amount	£ 40,800	52,002		£ 76,000	92,180
Principal Amount Outstanding		49,780			91,880
Unrealized Gain/(Loss)		$ (2,222)			$ 300
Reset Date	Oct. 30, 2023	Oct. 30, 2023	Oct. 30, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023
Senior Secured Facility and SPV Financing Facilities Two | British Pound
Debt Instrument [Line Items]
Original Principal Amount	£ 6,200	$ 8,408		£ 6,200	$ 8,408
Principal Amount Outstanding		7,565			7,495
Unrealized Gain/(Loss)		$ 843			$ 913
Reset Date	Nov. 01, 2023	Nov. 01, 2023	Nov. 01, 2023	Feb. 01, 2023	Feb. 01, 2023	Feb. 01, 2023	Feb. 01, 2023	Feb. 01, 2023
Senior Secured Facility and SPV Financing Facilities Three | British Pound
Debt Instrument [Line Items]
Original Principal Amount	£ 3,500	$ 4,747		£ 3,500	$ 4,747
Principal Amount Outstanding		4,270			4,231
Unrealized Gain/(Loss)		$ 477			$ 516
Reset Date	Oct. 30, 2023	Oct. 30, 2023	Oct. 30, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023
Senior Secured Facility and SPV Financing Facilities Four | Australian Dollar
Debt Instrument [Line Items]
Original Principal Amount					$ 7,402		$ 10,000
Principal Amount Outstanding					6,809
Unrealized Gain/(Loss)					$ 593
Reset Date				Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023
Senior Secured Facility and SPV Financing Facilities Four | European Euro
Debt Instrument [Line Items]
Original Principal Amount		$ 325,253	€ 316,000
Principal Amount Outstanding		334,091
Unrealized Gain/(Loss)		$ (8,838)
Reset Date	Oct. 30, 2023	Oct. 30, 2023	Oct. 30, 2023
Senior Secured Facility and SPV Financing Facilities Five
Debt Instrument [Line Items]
Original Principal Amount | €			€ 366,500
Senior Secured Facility and SPV Financing Facilities Five | European Euro
Debt Instrument [Line Items]
Original Principal Amount					$ 282,015	€ 277,000
Principal Amount Outstanding					296,515
Unrealized Gain/(Loss)					$ (14,500)
Reset Date				Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023
Senior Secured Facility and SPV Financing Facilities Six | Swedish Krona
Debt Instrument [Line Items]
Original Principal Amount					$ 3,237			kr 34,000
Principal Amount Outstanding					3,258
Unrealized Gain/(Loss)					$ (21)
Reset Date				Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023	Jan. 31, 2023