Fair Value Measurements - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Mortgages Payable | Fair Value
Financial liabilities:
Financial liabilities	$ 1,814,780	$ 1,606,470
Mortgages Payable | Carrying Amount
Financial liabilities:
Financial liabilities	1,788,259	1,603,869
Revolving Credit Facility | Fair Value
Financial liabilities:
Financial liabilities	300,363
Revolving Credit Facility | Carrying Amount
Financial liabilities:
Financial liabilities	300,000
Unsecured term loans | Fair Value
Financial liabilities:
Financial liabilities	400,519	399,678
Unsecured term loans | Carrying Amount
Financial liabilities:
Financial liabilities	$ 400,000	$ 400,000