Debt - Schedule of Mortgages Payable (Details) - Mortgages Payable - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Variable interest rate	2.15%
Variable rate amount	$ 677,246	$ 678,346
Fixed interest rate	4.32%
Fixed rate amount	$ 924,389	925,523
Debt, gross	1,601,635	1,603,869
Unamortized deferred financing costs and premium/ discount, net	(9,752)	(10,131)
Long-term debt, net	1,591,883	$ 1,593,738
Other assets, net
Debt Instrument [Line Items]
Net deferred finance costs	$ 4,600