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Goodwill and Other Intangible Assets (Schedule of Estimated Amortization Expense) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 6,232
2019 6,232
2020 6,232
2021 6,161
2022 $ 3,955