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Goodwill and Other Intangible Assets (Schedule Of Estimated Amortization Expense) (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 36,491
2019 36,488
2020 36,102
2021 36,099
2022 $ 36,087