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Intangible Assets and Goodwill - Estimated Future Amortization of Intangible Assets, Other Than Goodwill (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]  
Remainder of 2017 $ 4,031
2018 15,685
2019 15,522
2020 15,293
2021 14,786
Estimated future amortization expense over next five years $ 65,317