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Employee Benefit Plans (Summary Of Status Of Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Actual contributions during the year $ 6,825 $ 4,750 $ 77,743
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 355,356 300,244  
Service cost 9,522 8,255 9,801
Interest cost 10,112 11,712 10,290
Actuarial (gain)/loss 43,595 46,206  
Benefits paid (14,115) (11,062)  
Projected benefit obligation at end of year 404,471 355,356 300,244
Fair value of plan assets at beginning of year 301,467 260,531  
Actual return on plan assets 60,286 47,247  
Actual contributions during the year 6,825 4,750  
Administrative expenses paid  
Benefits paid (14,115) (11,062)  
Fair value of plan assets at end of year 354,464 301,467 260,531
Funded status at end of year (50,007) (53,889)  
Post-Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 29,376 28,483  
Service cost 1,066 983 1,312
Interest cost 845 980 999
Amendments  
Actuarial (gain)/loss 4,042 (582)  
Benefits paid (232) (488)  
Projected benefit obligation at end of year 35,098 29,376 28,483
Fair value of plan assets at beginning of year  
Actual contributions by participant during the year 232 488  
Benefits paid (232) (488)  
Fair value of plan assets at end of year
Funded status at end of year $ (35,098) $ (29,376)