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Retirement Plans And Other Postretirement Benefits (Schedule Of Amounts Before Related Deferred Income Taxes In Accumulated Other Comprehensive Income That Are Expected To Be Recognized As Components Of Net Periodic Benefit Or Cost) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($)
Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Prior service cost (benefit) | $ 5
Net actuarial (gain) loss | 12,329
Other Post-Retirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Prior service cost (benefit) | 0
Net actuarial (gain) loss | $ (245)

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