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Deferred Income Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Deferred Tax Assets and Liabilities [Line Items]    
Accrued liabilities $ 7,332 $ 5,287
Employee benefits and compensation 16,002 15,100
Inventories   6,809
Stock options and restricted stock 8,389 8,596
Pension and postretirement benefits 65,520 60,455
Derivatives 20,381 15,072
Cellulosic biofuel tax credit carryforward   167,452
Total deferred tax assets 117,624 278,771
Property, plant and equipment (210,486) (216,109)
Goodwill and intangible assets (7,267) (10,676)
Inventories (1,533)  
Investment in joint venture (1,119) (1,121)
Total deferred tax liabilities (220,405) (227,906)
Net deferred tax assets (liabilities) $ (102,781) $ 50,865