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Goodwill and Intangible Assets - Estimated Future Amortization Expense By Year From Amortizable Intangibles (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 (remaining six months) $ 64,032  
2020 123,397  
2021 102,993  
2022 93,467  
2023 93,467  
Thereafter 496,081  
Finite-lived intangible assets, net $ 973,437 $ 1,042,565