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Goodwill and Intangible Assets - Estimated Future Amortization Costs (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Estimated Amortization Expense    
Total $ 2,540,054 $ 2,589,329
Acquired developed technologies    
Estimated Amortization Expense    
2019 (remainder) 184,982  
2020 245,995  
2021 198,981  
2022 153,990  
2023 153,990  
Thereafter 1,491,015  
Total $ 2,428,953 $ 2,478,228