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Employee Benefit Plans (Schedule of Benefits Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension Benefit Plan [Member]        
Periodic costs for employee retirement benefit plans        
Service Cost $ 543 $ 607 $ 1,628 $ 1,820
Interest Cost 857 765 2,570 2,296
Expected Return on Assets (1,173) (1,218) (3,520) (3,653)
Amortization of Unrecognized Losses 404 415 1,213 1,244
Amortization of Unrecognized Prior Service Cost (Credit)
Net Periodic Benefit Cost [1] 631 569 1,891 1,707
Other Benefits Plan [Member]        
Periodic costs for employee retirement benefit plans        
Service Cost 210 284 630 851
Interest Cost 496 474 1,488 1,423
Expected Return on Assets (613) (637) (1,838) (1,912)
Amortization of Unrecognized Losses 330 447 989 1,340
Amortization of Unrecognized Prior Service Cost (Credit) (402) (1,205)
Net Periodic Benefit Cost [1] $ 423 $ 166 $ 1,269 $ 497
[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.