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Mortgages Payable - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
mortgage
Mar. 31, 2019
USD ($)
mortgage
Dec. 31, 2019
USD ($)
Debt      
Principal payments on mortgages payable $ 1,673 $ 1,235  
Number of mortgages assumed | mortgage 0    
Mortgages Payable      
Debt      
Principal payments on mortgages payable $ 1,700 $ 1,200  
Number of mortgages assumed | mortgage   0  
Unamortized net premiums 2,600    
Deferred financing costs $ 1,200   $ 1,300