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Goodwill and Other Intangible Assets (Schedule of Expected Amortization Expense) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity    
2018 $ 7,036  
2019 6,314  
2020 5,991  
2021 5,971  
2022 5,904  
2023 and thereafter 26,224  
Net Carrying Amount $ 57,440 $ 63,519