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Pension and Other Postretirement Benefit Plans (Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates) (Details) - Other Postretirement Benefits
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Effect on total of service and interest cost components one percentage point increase $ 2,023
Effect on total of service and interest cost components one percentage point decrease (1,725)
Effect on accumulated postretirement benefit obligation one percentage point increase 48,891
Effect on accumulated postretirement benefit obligation one percentage point decrease $ (41,917)