Mortgages Payable - Summary of Mortgages Payable (Details) - Mortgages payable $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) mortgage property	Dec. 31, 2022 USD ($) property mortgage
Debt
Number of properties | property	135	136
Weighted Average Stated Interest Rate (as a percent)	4.80%	4.80%
Weighted Average Effective Interest Rate (as a percent)	3.30%	3.30%
Weighted Average Remaining Years Until Maturity	10 months 24 days	1 year 4 months 24 days
Remaining Principal Balance	$ 836,300	$ 842,300
Unamortized Premium and Deferred Financing Costs Balance, net	5,400	11,600
Mortgage Payable Balance	$ 841,700	$ 853,900
Number of mortgages | mortgage	17	18
Number of Sterling-denominated mortgages paid quarterly | mortgage	1	1
Minimum
Debt
Weighted Average Effective Interest Rate (as a percent)	2.00%	2.70%
Stated interest rate (as a percent)	3.00%	3.00%
Maximum
Debt
Weighted Average Effective Interest Rate (as a percent)	6.60%	6.60%
Stated interest rate (as a percent)	6.90%	6.90%