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Goodwill and Intangible Assets - Estimated Future Amortization Expense By Year From Amortizable Intangibles (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 (remaining six months) $ 84,072  
2019 133,661  
2020 127,022  
2021 106,555  
2022 96,998  
Thereafter 628,989  
Finite-lived intangible assets, net $ 1,177,297 $ 1,292,022