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Debt - Scheduled Principal Repayments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2020 $ 437,329  
2021 287,723  
2022 167,514  
2023 415,476  
2024 211,991  
Thereafter 197,895  
Long-term debt and convertible notes payable 1,717,928 $ 1,560,333
Unamortized premium 651 753
Net unamortized debt issuance costs (10,383) (10,541)
Total Indebtedness $ 1,708,196 $ 1,550,545