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Goodwill and Other Intangible Assets (Schedule Of Expected Future Amortization Expense) (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 3,847
2019 3,847
2020 3,847
2021 3,847
2022 3,847
Thereafter $ 10,376