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Employee Benefit Plans (Schedule of Periodic Costs For Employee Retirement Benefit Plans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefit Plan [Member]      
Periodic costs for employee retirement benefit plans      
Service Cost $ 2,696 $ 2,434 $ 2,171
Interest Cost 2,706 3,099 3,426
Expected Return on Plan Assets (6,225) (5,635) (4,694)
Amortization of Net Actuarial Loss 2,868 2,059 1,618
Net Periodic Benefit Cost [1] 2,045 1,957 2,521
Other Benefits Plan [Member]      
Periodic costs for employee retirement benefit plans      
Service Cost 917 993 839
Interest Cost 1,236 1,699 1,984
Expected Return on Plan Assets (3,142) (2,853) (2,451)
Amortization of Net Actuarial Loss 527 1,352 1,319
Net Periodic Benefit Cost [1] $ (462) $ 1,191 $ 1,691
[1] Service cost is included in Operations and Maintenance expense on the consolidated statements of income; all other amounts are included in Other Income (Expense), net.