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Business and Significant Accounting Policies - Estimated Future Amortization Expense by Year from Purchased Intangibles (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 $ 129,394  
2020 122,756  
2021 102,338  
2022 92,801  
2023 and thereafter 595,276  
Finite-lived intangible assets, net $ 1,042,565 $ 1,292,022