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Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Deferred tax assets:    
Employee benefits $ 7,930 $ 11,599
Postretirement employee benefits 47,024 55,186
Incentive compensation 7,949 2,835
Pensions 34,919 22,067
Federal and state credit carryforwards 30,809 45,238
Net operating losses 16,749 21,444
Federal benefit from state taxes resulting from uncertain tax positions 5,595 5,595
Other 6,492 3,146
Total deferred tax assets 157,467 167,110
Valuation allowance (8,025) (5,229)
Deferred tax assets, net of valuation allowance 149,442 161,881
Deferred tax liabilities:    
Plant and equipment (166,885) (168,572)
Intangible assets (10,879) (13,238)
Inventories (1,570) (3,350)
Other   (411)
Total deferred tax liabilities (179,334) (185,571)
Net deferred tax liabilities $ (29,892) $ (23,690)