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Goodwill and Other Intangible Assets - Future Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Estimated future aggregate amortization expense    
2021 $ 4,352  
2022 3,867  
2023 3,867  
2024 3,630  
2025 3,440  
Thereafter 7,051  
Intangible assets subject to amortization, Net Book Value $ 26,207 $ 30,802