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Debt - Future Scheduled Principal Payments of Debt Obligations (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2018 (remaining nine months) $ 4,556  
2019 6,992  
2020 9,536  
2021 21,883  
2022 43,954  
2023 142,036  
Thereafter 312,270  
Total debt before unamortized debt issue costs 541,227 $ 540,454
Unamortized mortgage debt issue costs (2,048) (2,138)
Total debt outstanding $ 539,179 $ 538,316