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Pension Plans And Other Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Operating Activities, Cash Flow Statement | $ (13,526) | $ 1,114 | $ 1,860
Percentage point increases in accumulated postretirement benefit obligation | 13,900 |  |
Percentage point increase in service and interest cost | 800 |  |
Percentage point decrease in accumulated postretirement benefit obligation | 10,700 |  |
Percentage point decrease in service and interest cost | 600 |  |
Payment for Pension Benefits | 22,000 | 22,000 | $ 22,000
Pension Plan And SERP [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to defined benefit pension plan | 22,000 | 22,000 |
Expected contributions to pension plan | 22,000 |  |
Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to defined benefit pension plan | 0 | $ 0 |
Expected contributions to pension plan | $ 6,700 |  |
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocation | 35.00% | 37.00% |
Equity Securities [Member] | Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocation | 60.00% | 60.00% |
Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocation | 49.00% | 45.00% |
Debt Securities [Member] | Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target investment allocation | 40.00% | 40.00% |

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