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Debt - Future Scheduled Principal Payments of Debt Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2019 (remaining six months) $ 4,425  
2020 9,536  
2021 21,963  
2022 88,954  
2023 142,545  
2024 296,658  
Thereafter 15,907  
Total debt before unamortized debt issue costs 579,988 $ 585,055
Unamortized mortgage debt issue costs (1,585) (1,773)
Total debt outstanding $ 578,403 $ 583,282