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Goodwill and Other Intangible Assets (Schedule of the Estimated Amortization Expense) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
The estimated amortization expense for five succeeding years:  
2018 $ 5,917
2019 4,858
2020 3,841
2021 2,927
2022 2,022
Thereafter 2,885
Total $ 22,450