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Mortgage and Other Indebtedness - Amortization Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Amortization of debt issuance costs $ 2,135 $ 2,762 $ 3,944