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Goodwill and Other Intangible Assets - Expected Amortization Expense (Details) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months (2018) $ 19,450
Finite-Lived Intangible Assets, Amortization Expense, Year Two (2019) 19,080
Finite-Lived Intangible Assets, Amortization Expense, Year Three (2020) 18,140
Finite-Lived Intangible Assets, Amortization Expense, Year Four (2021) 15,360
Finite-Lived Intangible Assets, Amortization Expense, Year Five (2022) $ 11,810