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Intangible Assets and Goodwill - Estimated Future Amortization of Intangible Assets, Other Than Goodwill (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]  
2018 $ 17,614
2019 17,482
2020 17,288
2021 16,775
2022 14,511
Estimated future amortization expense over next five years $ 83,670