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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Amortization of net loss $ (1,445) $ (725) $ (1,142)
Total recognized in other comprehensive income 519 (6,145)  
Defined Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (loss) gain (867) (6,849)  
Amortization of net loss 1,445 725  
Amortization of prior service credit   (5)  
Total recognized in other comprehensive income 578 (6,129)  
Postretirement Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial (loss) gain (12) 26  
Amortization of net loss 18 25  
Amortization of prior service credit (65) (67)  
Total recognized in other comprehensive income $ (59) $ (16)