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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions by employer | $ 3,900,000 | $ 3,700,000 | $ 2,400,000 |
Accumulated benefit obligation | 458,100,000 | 417,400,000 |  |
Funding of pension and other postretirement benefit plans | $ 5,678,000 | 57,580,000 | $ 10,638,000 |
Expected return on plan assets | 5.75% |  |  |
Expected increase in net periodic cost due to 25 basis point decrease in pension discount rate | $ 1,100,000 |  |  |
Expected increase in projected benefit obligation due to 25 basis point decrease in pension discount rate | 13,600,000 |  |  |
Expected increase in net periodic cost due to 25 basis point decrease in the assumption for expected return on plan assets | 900,000 |  |  |
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 benefit contributions, voluntary |  | $ 44,000,000.0 |  |
Non-qualified pension plan and other postretirement employee benefit, estimated payments in next fiscal year | $ 4,400,000 |  |  |
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Decrease in accumulated postretirement benefit obligations |  |  |  | $ 76,700,000
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 | 100.00% |  |  |
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] |  |  |  |
Estimated net loss to be amortized from Accumulated Other Comprehensive Loss into Net Periodic Benefit Cost | $ 17,000,000.0 |  |  |
Estimated prior service cost to be amortized from Accumulated Other Comprehensive Loss into Net Periodic Benefit Cost | 100,000 |  |  |
Non-qualified pension plan and other postretirement employee benefit, estimated payments in next fiscal year | 30,769,000 |  |  |
Pension Plans [Member] | Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Non-qualified pension plan and other postretirement employee benefit, estimated payments in next fiscal year | 2,200,000 |  |  |
Other Postretirement Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Estimated net loss to be amortized from Accumulated Other Comprehensive Loss into Net Periodic Benefit Cost | 1,700,000 |  |  |
Estimated prior service cost to be amortized from Accumulated Other Comprehensive Loss into Net Periodic Benefit Cost | 1,300,000 |  |  |
Non-qualified pension plan and other postretirement employee benefit, estimated payments in next fiscal year | 4,548,000 |  |  |
Other Postretirement Benefit Plans [Member] | Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Non-qualified pension plan and other postretirement employee benefit, estimated payments in next fiscal year | $ 4,500,000 |  |  |
Non Deltic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Health care cost trend rate assumed for next fiscal year | 7.51% |  |  |
Defined Benefit Plan, Assumption Health Care Cost Trend Rate for Next Fiscal Year | 4.50% |  |  |
Deltic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Health care cost trend rate assumed for next fiscal year | 7.18% |  |  |
Defined Benefit Plan, Assumption Health Care Cost Trend Rate for Next Fiscal Year | 4.50% |  |  |

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