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Goodwill and Intangible Assets - Estimated Future Amortization Expense By Year From Amortizable Intangibles (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 (remaining three months) $ 34,865  
2019 130,158  
2020 123,567  
2021 103,100  
2022 93,538  
Thereafter 600,508  
Finite-lived intangible assets, net $ 1,085,736 $ 1,292,022