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Debt - Scheduled Principal Repayments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2019 $ 219,118  
2020 527,304  
2021 180,511  
2022 48,528  
2023 370,680  
Thereafter 214,192  
Long-term debt and convertible notes payable 1,560,333 $ 1,438,386
Unamortized premium 753 856
Net unamortized debt issuance costs (10,541) (14,833)
Total Indebtedness $ 1,550,545 $ 1,424,409