Fair Value Measurements - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Mortgages Payable | Fair Value
Financial liabilities:
Financial liabilities	$ 1,223,797	$ 1,162,890
Mortgages Payable | Carrying Amount
Financial liabilities:
Financial liabilities	1,300,626	1,127,848
Revolving Credit Facility | Fair Value
Financial liabilities:
Financial liabilities	196,930	200,177
Revolving Credit Facility | Carrying Amount
Financial liabilities:
Financial liabilities	200,000	200,000
Tranche A-1 Term Loan | Fair Value
Financial liabilities:
Financial liabilities	296,208	300,607
Tranche A-1 Term Loan | Carrying Amount
Financial liabilities:
Financial liabilities	$ 300,000	$ 300,000