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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)