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Debt - Schedule of Maturities of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Remainder of fiscal year $ 0  
2022 2,103  
2023 2,103  
2024 2,103  
2025 2,103  
Thereafter 198,190  
Total secured debt at par value $ 206,602 $ 217,804