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Benefit Plan (Components Of Net Periodic Benefit Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]        
Pension plan contributions     $ 0 $ 0
Service cost $ 2,080 $ 1,468 6,240 4,404
Interest cost 1,320 1,373 3,960 4,119
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 92 285 276 855
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 2,080 1,468 6,240 4,404
Interest cost 1,320 1,373 3,960 4,119
Expected return on plan assets (3,602) (3,026) (10,806) (9,078)
Recognized net actuarial loss 294 470 882 1,410
Benefit expense 92 285 276 855
Supplemental Employee Retirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 218 202 801 604
Interest cost 134 165 401 495
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 352 367 1,202 1,099
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 218 202 801 604
Interest cost 134 165 401 495
Benefit expense $ 352 $ 367 $ 1,202 $ 1,099