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Debt - Schedule of Mortgages Payable (Details) - Mortgages Payable - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Variable interest rate 2.08%  
Variable rate amount $ 762,246 $ 678,346
Fixed interest rate 4.32%  
Fixed rate amount $ 922,161 925,523
Debt, gross 1,684,407 1,603,869
Unamortized deferred financing costs and premium/ discount, net (10,122) (10,131)
Long-term debt, net 1,674,285 $ 1,593,738
Other assets, net    
Debt Instrument [Line Items]    
Net deferred finance costs $ 4,000