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Mortgages Payable - Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt    
Unamortized premium balance $ 4,400  
Mortgages Payable    
Debt    
Unamortized premium balance 4,400  
Deferred financing costs 183 $ 236
Maturity of mortgages payable, excluding net premiums    
2019 20,700  
2020 82,400  
2021 67,000  
2022 109,700  
2023 6,700  
Thereafter 11,900  
Totals $ 298,400