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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Amortization of net loss $ (725) $ (1,142) $ (938)
Total recognized in other comprehensive income (6,145) 2,575  
Defined Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial gain (loss) (6,849) 1,475  
Amortization of net loss 725 1,142  
Amortization of prior service (credit) cost (5) 17  
Total recognized in other comprehensive income (6,129) 2,634  
Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial gain (loss) 26 (15)  
Amortization of net loss 25 24  
Amortization of prior service (credit) cost (67) (68)  
Total recognized in other comprehensive income $ (16) $ (59)