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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, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Total recognized in accumulated other comprehensive loss $ (17,605) $ (17,613)
Deferred tax benefit 6,974 6,977
Amounts included in accumulated other comprehensive loss (10,631) (10,636)
Defined Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (17,715) (17,747)
Prior service credit (cost) (32) (52)
Total recognized in accumulated other comprehensive loss (17,747) (17,799)
Other Postretirement Benefit Plans Defined Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (162) (186)
Prior service credit (cost) 304 372
Total recognized in accumulated other comprehensive loss $ 142 $ 186