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Employee Benefit Plans (Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Amortization of net loss $ (938) $ (926) $ (159)
Total recognized in other comprehensive income 666 8  
Defined Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial gain (loss) (189) (894)  
Amortization of net loss 938 926  
Amortization of prior service credit 20 20  
Total recognized in other comprehensive income 769 52  
Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial gain (loss) (53) 7  
Amortization of net loss 17 17  
Amortization of prior service credit (67) (68)  
Total recognized in other comprehensive income $ (103) $ (44)