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Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred tax assets: |  |
Employee benefits | $ 8,612 | $ 8,630
Postretirement employee benefits | 41,515 | 52,751
Incentive compensation | 8,937 | 9,130
Deferred Tax Assets, Inventory | 5,898 | 0
Pensions | 152 | 31,140
Federal and state credit carryforwards | 27,597 | 20,447
Net operating losses | 13,930 | 7,649
Federal benefit from state taxes resulting from uncertain tax positions | 0 | 5,595
Other | 7,390 | 5,757
Total deferred tax assets | 114,031 | 141,099
Valuation allowance | (13,622) | (14,957)
Deferred tax assets, net of valuation allowance | 100,409 | 126,142
Deferred tax liabilities: |  |
Plant and equipment | (178,227) | (157,973)
Intangible assets | (9,542) | (10,843)
Deferred Tax Liabilities, Inventory | 0 | 314
Deferred Tax Liabilities, Gross | 187,769 | 169,130
Total deferred tax liabilities | $ (87,360) | $ (42,988)

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