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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, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Total recognized in accumulated other comprehensive loss $ (20,509) $ (14,364)
Deferred tax benefit 7,273 5,723
Amounts included in accumulated other comprehensive loss (13,236) (8,641)
Defined Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (20,472) (14,348)
Prior service credit (cost)   5
Total recognized in accumulated other comprehensive loss (20,472) (14,343)
Postretirement Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss (139) (190)
Prior service credit (cost) 102 169
Total recognized in accumulated other comprehensive loss $ (37) $ (21)