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Debt - Mortgages Payable (Details) - Mortgages payable - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Mortgages payable $ 240,351 $ 370,804
Premium, net of accumulated amortization 299 478
Discount, net of accumulated amortization (167) (195)
Debt issuance costs, net of accumulated amortization (1,219) (1,611)
Total mortgages payable, net $ 239,264 $ 369,476
Weighted average interest rate (percent) 4.37% 5.13%
Minimum    
Debt Instrument [Line Items]    
Fixed interest rate (percent) 3.49% 3.49%
Maximum    
Debt Instrument [Line Items]    
Fixed interest rate (percent) 5.49% 10.45%