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Business Combinations, Goodwill and Intangible Assets - Estimated Future Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Intangible Assets    
2021 $ 1,959  
2022 1,959  
2023 1,952  
2024 1,689  
2025 1,628  
Thereafter 10,061  
Total $ 19,248 $ 14,009