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Employee Benefit Plans (Components Of Other Comprehensive Loss Related To Defined Benefit Plan And Postretirement Benefit Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Total recognized in accumulated other comprehensive loss $ (14,364) $ (16,939)
Deferred tax benefit 5,723 6,717
Amounts included in accumulated other comprehensive loss (8,641) (10,222)
Defined Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (14,348) (16,966)
Prior service credit (cost) 5 (12)
Total recognized in accumulated other comprehensive loss (14,343) (16,978)
Postretirement Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (190) (198)
Prior service credit (cost) 169 237
Total recognized in accumulated other comprehensive loss $ (21) $ 39