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Debt - Future Scheduled Principal Payments of Debt Obligations (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2021 (remaining three months) $ 2,450  
2022 79,249  
2023 117,876  
2024 328,898  
2025 15,934  
Thereafter 0  
Total debt before unamortized debt issue costs 544,407 $ 609,741
Unamortized mortgage debt issue costs (710) (971)
Total debt outstanding $ 543,697 $ 608,770