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Employee Benefit Plans (Schedule of Benefits Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension Benefit Plan [Member]    
Periodic costs for employee retirement benefit plans    
Service Cost $ 543 $ 607
Interest Cost 857 765
Expected Return on Assets (1,173) (1,218)
Amortization of Unrecognized Losses 404 415
Amortization of Unrecognized Prior Service Credit
Net Periodic Benefit Cost [1] 631 569
Other Benefits Plan [Member]    
Periodic costs for employee retirement benefit plans    
Service Cost 210 284
Interest Cost 496 474
Expected Return on Assets (613) (637)
Amortization of Unrecognized Losses 330 447
Amortization of Unrecognized Prior Service Credit (402)
Net Periodic Benefit Cost [1] $ 423 $ 166
[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.