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Intangible Assets - Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Estimated Intangible Assets Amortization    
2021 $ 25,872  
2022 20,407  
2023 17,731  
2024 15,277  
2025 3,674  
Thereafter 1,668  
Net Carrying Amount $ 84,629 $ 113,925