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Intangible Assets and Goodwill - Estimated Future Amortization of Intangible Assets, Other Than Goodwill (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
Remainder of 2018 $ 5,067
2019 20,597
2020 20,524
2021 19,741
2022 16,792
Estimated future amortization expense over next five years $ 82,721