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Intangible Assets - Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Estimated Intangible Assets Amortization    
2020 $ 35,069  
2021 25,131  
2022 19,102  
2023 16,490  
2024 14,482  
Thereafter 3,651  
Net Carrying Amount $ 113,925 $ 150,847