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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, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Total recognized in accumulated other comprehensive loss $ (16,939) $ (17,605)
Deferred tax benefit 6,717 6,974
Amounts included in accumulated other comprehensive loss (10,222) (10,631)
Defined Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (16,966) (17,715)
Prior service credit (cost) (12) (32)
Total recognized in accumulated other comprehensive loss (16,978) (17,747)
Postretirement Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (198) (162)
Prior service credit (cost) 237 304
Total recognized in accumulated other comprehensive loss $ 39 $ 142