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Debt - Scheduled Principal Repayments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2018 (Remainder) $ 38,938  
2019 192,839  
2020 468,162  
2021 180,514  
2022 76,529  
Thereafter 534,887  
Long-term debt and convertible notes payable 1,491,869 $ 1,438,386
Unamortized premium 779 856
Net unamortized debt issuance costs (10,919) (14,833)
Total Indebtedness $ 1,481,729 $ 1,424,409