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Goodwill and Intangible Assets - Estimated Future Amortization Expense By Year From Amortizable Intangibles (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 (remaining nine months) $ 96,977  
2020 124,391  
2021 103,949  
2022 94,410  
2023 94,410  
Thereafter 501,918  
Finite-lived intangible assets, net $ 1,016,055 $ 1,042,565