Mortgages Payable - Summary of Mortgages Payable (Details) - Mortgages payable $ in Thousands	Mar. 31, 2022 USD ($) property mortgage	Dec. 31, 2021 USD ($) property mortgage
Debt
Number of Properties | property	221	267
Weighted Average Stated Interest Rate (as a percent)	4.80%	4.80%
Weighted Average Effective Interest Rate (as a percent)	3.40%	3.50%
Weighted Average Remaining Years Until Maturity	1 year 7 months 6 days	1 year 9 months 18 days
Remaining Principal Balance	$ 1,069,311	$ 1,114,129
Unamortized Premium and Deferred Finance Costs Balance, net	24,288	27,866
Net payable amount	$ 1,093,599	$ 1,141,995
Number of mortgages | mortgage	21	22
Number of Sterling-denominated mortgages paid quarterly | mortgage	1
Minimum
Debt
Weighted Average Effective Interest Rate (as a percent)	2.60%	2.60%
Stated interest rate (as a percent)	3.00%	3.00%
Maximum
Debt
Weighted Average Effective Interest Rate (as a percent)	6.00%	6.00%
Stated interest rate (as a percent)	6.90%	6.90%