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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Income Taxes [Line Items] |  |
Income tax benefit | $ 10,862 | $ (1,591)
Pension settlement charge | 42,988 |
Pension Plans [Member] |  |
Income Taxes [Line Items] |  |
Income tax benefit | 11,200 |
Increase in deferred tax assets | 6,800 |
Remeasurement of pension plan obligations | 26,200 |
Deltic MDF Facility [Member] |  |
Income Taxes [Line Items] |  |
Reduction to deferred tax liabilities | (15,800) |
Increase to income taxes payable | $ 15,800 |

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