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Goodwill and Intangible Assets - Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2019 $ 123,497  
2020 130,154  
2021 146,843  
2022 149,053  
2023 127,249  
Thereafter 526,243  
Net $ 1,203,039 $ 43,449