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Debt - Future Scheduled Principal Payments of Debt Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2018 (remaining six months) $ 2,610  
2019 6,992  
2020 9,536  
2021 21,945  
2022 36,954  
2023 142,509  
Thereafter 312,483  
Total debt before unamortized debt issue costs 533,029 $ 540,454
Unamortized mortgage debt issue costs (1,957) (2,138)
Total debt outstanding $ 531,072 $ 538,316