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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets    
Allowance for doubtful accounts $ 755 $ 696
Asset impairment 782 764
Inventory 2,168 2,792
Deferred compensation 3,977 3,660
Other accrued liabilities 6,429 5,772
Hedging 467 700
Net operating loss carryforwards 12,046 310
Other 3,823 3,001
Total deferred tax assets 30,447 17,695
Less valuation allowance on deferred tax assets (298) (273)
Net deferred tax assets 30,149 17,422
Deferred tax liabilities    
Property, plant and equipment 77,126 30,235
Prepaid and other insurance reserves 5,182 3,855
Investment in unconsolidated affiliate 239 433
Other 687 695
Total deferred tax liabilities 83,234 35,218
Net deferred tax liabilities (53,085) (17,796)
Consolidated balance sheet classification:    
Net current deferred tax assets 13,613 3,224
Net noncurrent deferred tax liabilities (66,698) (21,020)
Net deferred tax liabilities (53,085) (17,796)
Net deferred tax liabilities by tax jurisdiction:    
Federal (48,503) (16,324)
State (4,582) (1,472)
Net deferred tax liabilities $ (53,085) $ (17,796)