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Mortgage Notes Payable (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Feb. 28, 2017
Sep. 30, 2017
Sep. 30, 2016
Debt Instrument [Line Items]      
Repayments of Notes Payable   $ 51,815 $ 167,197
The Army Navy Club Building Member      
Debt Instrument [Line Items]      
Repayments of Notes Payable $ 49,600