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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Amortization of net loss $ (1,270) $ (1,445) $ (725)
Total recognized in other comprehensive income 3,454 519  
Defined Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial gain (loss) 2,212 (867)  
Amortization of net loss 1,270 1,445  
Total recognized in other comprehensive income 3,482 578  
Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial gain (loss) (12) (12)  
Amortization of net loss 18 18  
Amortization of prior service credit (34) (65)  
Total recognized in other comprehensive income $ (28) $ (59)