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Debt - Future Scheduled Principal Payments of Debt Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 21,441  
2022 144,549  
2023 117,875  
2024 309,941  
2025 15,935  
Thereafter 0  
Total debt before unamortized debt issue costs 609,741 $ 586,860
Unamortized mortgage debt issue costs (971) (1,395)
Total debt outstanding $ 608,770 $ 585,465