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Mortgages Payable (Principal repayments for the next five years) (Details)
Dec. 31, 2016
USD ($)
Mortgages Payable [Abstract]  
Net carrying value of real estate collaterizing the debt $ 663,274,000
Repayments of Long-term Debt  
2017 3,707,000
2018 402,440,000
2019 0
2020 0
2021 300,000,000
Thereafter $ 350,000,000