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Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 700 | $ 600
Deferred tax assets: |  |
Employee benefits | 3,940 | 6,255
Postretirement employee benefits | 17,132 | 27,370
Incentive compensation | 5,194 | 11,356
Inventories | 7,959 | 8,859
Pensions | 2,516 | 8,338
Federal and state credit carryforwards | 11,752 | 8,369
Net operating losses | 3,088 | 1,462
Other | 1,949 | 3,774
Total deferred tax assets | 53,530 | 75,783
Valuation allowance | (3,733) | (4,407)
Deferred tax assets, net of valuation allowance | 49,797 | 71,376
Deferred tax liabilities: |  |
Plant and equipment | (153,885) | (206,502)
Intangible assets | (7,577) | (14,136)
Deferred Tax Liabilities, Gross | 161,462 | 220,638
Total deferred tax liabilities | (111,665) | $ (149,262)
Valuation allowances, State Tax Credits [Member] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 11,100 |

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