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Employee Benefit Plans (Schedule of Benefits Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Benefit Plan [Member]        
Periodic costs for employee retirement benefit plans        
Service Cost $ 609 $ 543 $ 1,217 $ 1,085
Interest Cost 775 857 1,550 1,713
Expected Return on Assets (1,409) (1,173) (2,818) (2,347)
Amortization of Unrecognized Losses 515 404 1,030 809
Net Periodic Benefit Cost [1] 490 631 979 1,260
Other Benefits Plan [Member]        
Periodic costs for employee retirement benefit plans        
Service Cost 248 210 497 420
Interest Cost 425 496 850 992
Expected Return on Assets (721) (613) (1,442) (1,226)
Amortization of Unrecognized Losses 338 330 676 660
Net Periodic Benefit Cost [1] $ 290 $ 423 $ 581 $ 846
[1] Service cost is included in Operations and Maintenance expense on Consolidated Statements of Income; all other amounts are included in Other Income/Expense, net.