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Debt - Future Scheduled Principal Payments of Debt Obligations (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2018 (remaining three months) $ 1,402  
2019 6,992  
2020 9,536  
2021 21,945  
2022 39,954  
2023 142,508  
Thereafter 312,478  
Total debt before unamortized debt issue costs 534,815 $ 540,454
Unamortized mortgage debt issue costs (1,865) (2,138)
Total debt outstanding $ 532,950 $ 538,316