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Intangible Assets and Goodwill - Estimated Future Amortization of Intangible Assets, Other Than Goodwill (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]  
Remainder of 2018 $ 14,206
2019 18,762
2020 18,561
2021 18,112
2022 15,797
Estimated future amortization expense over next five years $ 85,438