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Income Taxes (Schedule of Components of Deferred Income Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Pensions $ 41,380 $ 25,753
Postretirement employee benefits 25,642 28,771
Net operating loss carryforwards 9,202 8,104
Nondeductible accruals 4,296 5,226
Inventories 3,459 3,400
Tax credits 2,994 2,871
Incentive compensation 2,560 2,564
Employee benefits 1,695 1,891
Other 152 138
Deferred Tax Assets, Total 91,380 78,718
Valuation allowance (2,816) (1,919)
Deferred tax assets, net of valuation allowance 88,564 76,799
Timber and timberlands (6,142) (3,039)
Property, plant and equipment (12,589) (11,360)
Deferred tax liabilities, total (18,731) (14,399)
Net deferred tax assets (liabilities) $ 69,833 $ 62,400