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Mortgage Notes Payable - Schedule of Maturities of Long-term Debt (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
Jun. 30, 2017
€ / $
Jun. 30, 2017
£ / $
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Foreign currency exchange rate   1.14 1.30  
Mortgage notes payable        
Debt Instrument [Line Items]        
2017 (remainder) $ 1,149      
2018 131,213      
2019 280,924      
2020 321,030      
2021 43,139      
2022 0      
Thereafter 0      
Mortgage notes payable $ 777,455     $ 754,987