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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions by employer |  | $ 4,300,000 | $ 4,200,000 | $ 4,000,000
Accumulated benefit obligation |  | 223,500,000 | 223,700,000 |
Funding of pension and other postretirement benefit plans |  | 3,336,000 | 5,065,000 | $ 9,044,000
Level 3 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Investments in Level 3 |  | 0 | $ 0 |
Qualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  | $ 4,400,000 |  |
Management Deferred Compensation Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Annual incentive plan, employee permitted minimum defer percentage |  | 50.00% |  |
Annual incentive plan, employee permitted maximum defer percentage |  | 90.00% |  |
Management Deferred Compensation Plan [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Basic salary defer percentage |  | 50.00% |  |
Pension Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Change in monthly retirement benefit amount |  | $ 0 |  |
Non-cash pretax settlement charge |  | $ 14,200,000 |  |
Discount rate used to measure projected benefit obligations for qualified pension plans |  | 5.55% | 5.60% |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  | $ 16,261,000 |  |
Pension Plans [Member] | Qualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Transfer of outstanding pension benefit obligation related to qualified pension plans to insurance company | $ 75,600,000 |  |  |
Defined Benefit Plan, Funding Status [Extensible Enumeration] | Defined Benefit Plan, Funded Plan [Member] |  |  |
Discount rate used to measure projected benefit obligations for qualified pension plans |  |  | 3.95% | 3.00%
Pension Plans [Member] | Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  | $ 2,600,000 |  |
Other Postretirement Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount rate used to measure projected benefit obligations for qualified pension plans |  | 5.45% | 5.55% |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  | $ 1,949,000 |  |
Defined Benefit Plan, Assumption Health Care Cost Trend Rate for Next Fiscal Year |  | 4.00% |  |
Other Postretirement Benefit Plans [Member] | Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension plan and other postretirement employee benefit, estimated payments in next fiscal year |  | $ 1,900,000 |  |
Other Postretirement Benefit Plans [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Health care cost trend rate assumed for next fiscal year |  | 9.00% |  |
Other Postretirement Benefit Plans [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Health care cost trend rate assumed for next fiscal year |  | 10.62% |  |

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