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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Amounts not deductible for tax purposes:    
Allowance for doubtful accounts $ 872 $ 723
Asset impairment 756 725
Inventory 1,724 2,214
Deferred compensation 4,096 3,996
Other accrued liabilities 5,474 4,929
Hedging 1,033 575
Net operating loss carryforwards 392 361
Other 1,069 1,210
Total deferred tax assets 15,416 14,733
Less valuation allowance on deferred tax assets (344) (310)
Net deferred tax assets 15,072 14,423
Deferred tax liabilities    
Property, plant and equipment 28,766 19,886
Prepaid and other insurance reserves 2,504 1,852
Investment in unconsolidated affiliate 640 837
Other 713 713
Total deferred tax liabilities 32,623 23,288
Net deferred tax liabilities (17,551) (8,865)
Consolidated balance sheet classification:    
Net current deferred tax assets 4,275 5,396
Net non-current deferred tax liabilities (21,826) (14,261)
Net deferred tax assets (liabilities) by tax jurisdiction:    
Federal (15,724) (8,202)
State $ (1,827) $ (663)