Debt - Summary of Senior Unsecured Credit Facility (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Senior Unsecured Credit Facility
Debt outstanding	$ 970,312	$ 722,075
Unamortized discount	37,597
Unsecured Term Loans:
Senior Unsecured Credit Facility
Debt outstanding	507,652	311,479
Unsecured Term Loans: | GBP
Senior Unsecured Credit Facility
Debt outstanding	298,070	202,183
Unamortized discount	$ 1,600	900
Unsecured Term Loans: | GBP | GBP LIBOR
Senior Unsecured Credit Facility
Variable interest rate (percentage)	0.85%
Unsecured Term Loans: | EUR
Senior Unsecured Credit Facility
Debt outstanding	$ 209,582	109,296
Unsecured Term Loans: | EUR | EURIBOR
Senior Unsecured Credit Facility
Variable interest rate (percentage)	0.85%
Unsecured Revolving Credit Facility:
Senior Unsecured Credit Facility
Debt outstanding	$ 462,660	410,596
Unsecured Revolving Credit Facility: | GBP
Senior Unsecured Credit Facility
Debt outstanding	0	184,660
Unsecured Revolving Credit Facility: | EUR
Senior Unsecured Credit Facility
Debt outstanding	0	205,001
Unsecured Revolving Credit Facility: | USD
Senior Unsecured Credit Facility
Debt outstanding	$ 446,000	0
Unsecured Revolving Credit Facility: | USD | LIBOR
Senior Unsecured Credit Facility
Variable interest rate (percentage)	0.775%
Unsecured Revolving Credit Facility: | JPY
Senior Unsecured Credit Facility
Debt outstanding	$ 16,660	$ 20,935
Unsecured Revolving Credit Facility: | JPY | JPY LIBOR
Senior Unsecured Credit Facility
Variable interest rate (percentage)	0.775%