Fair Value Measurements - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Mortgages Payable | Fair Value
Financial liabilities:
Financial liabilities	$ 1,795,938	$ 1,814,780
Mortgages Payable | Carrying Amount
Financial liabilities:
Financial liabilities	1,787,081	1,788,259
Revolving Credit Facility | Fair Value
Financial liabilities:
Financial liabilities	300,376	300,363
Revolving Credit Facility | Carrying Amount
Financial liabilities:
Financial liabilities	300,000	300,000
Unsecured term loans | Fair Value
Financial liabilities:
Financial liabilities	400,415	400,519
Unsecured term loans | Carrying Amount
Financial liabilities:
Financial liabilities	$ 400,000	$ 400,000