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Indebtedness - Schedule of Required Principal Payments on Outstanding Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2020 $ 597  
2021 24,836  
2022 0  
2023 0  
2024 0  
Thereafter 0  
Total $ 25,433 $ 276,000