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Goodwill and Intangible Assets - Estimated Future Amortization Expense By Year From Amortizable Intangibles (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 (remaining nine months) $ 138,953  
2019 135,868  
2020 129,461  
2021 108,979  
2022 99,363  
Thereafter 635,147  
Finite-lived intangible assets, net $ 1,247,771 $ 1,292,022