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Goodwill and Other Intangible Assets (Schedule Of Estimated Amortization Expense) (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 37,758
2018 37,001
2019 36,980
2020 36,974
2021 $ 36,613