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Mortgages Payable (Principal repayments for the next five years) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
Net carrying value of real estate collateralizing the debt $ 640,025
Repayments of Long-term Debt  
2018 402,440
2019 0
2020 0
2021 0
2022 350,000
Thereafter $ 500,000