Fair Value Measurements - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Mortgage loans | Fair Value
Financial liabilities:
Financial liabilities	$ 1,741,108	$ 1,830,651
Mortgage loans | Carrying Amount
Financial liabilities:
Financial liabilities	1,817,915	1,901,875
Unsecured term loans | Fair Value
Financial liabilities:
Financial liabilities	550,929	551,369
Unsecured term loans | Carrying Amount
Financial liabilities:
Financial liabilities	$ 550,000	$ 550,000