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Mortgages Payable - Maturities (Details) - Mortgages Payable - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt    
Unamortized premium balance $ 4,700  
Remaining balance of deferred financing costs at period end 196 $ 236
Maturity of mortgages payable, excluding net premiums    
2018 7,300  
2019 20,700  
2020 82,400  
2021 67,000  
2022 109,700  
Thereafter 18,600  
Totals $ 305,700