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Employee Benefit Plans (Summary Of Status Of Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 4,750 $ 77,743 $ 10,534
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 300,244 316,202  
Service cost 8,255 9,801 10,949
Interest cost 11,712 10,290 10,034
Actuarial (gain)/loss 46,206 (29,966)  
Curtailment  
Benefits paid (11,062) (6,084)  
Projected benefit obligation at end of year 355,356 300,244 316,202
Fair value of plan assets at beginning of year 260,531 210,267  
Actual return on plan assets 47,247 (21,395)  
Actual contributions during the year 4,750 77,743  
Administrative expenses paid  
Benefits paid (11,062) (6,084)  
Fair value of plan assets at end of year 301,467 260,531 210,267
Funded status at end of year (53,889) (39,713)  
Post-Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 28,483 34,717  
Service cost 983 1,312 1,570
Interest cost 980 999 1,184
Amendments (582)  
Actuarial (gain)/loss (7,985)  
Benefits paid (488) (561)  
Projected benefit obligation at end of year 29,376 28,483 34,717
Fair value of plan assets at beginning of year  
Actual contributions during the year 488 561  
Benefits paid (488) (561)  
Fair value of plan assets at end of year
Funded status at end of year $ (29,376) $ (28,483)