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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Inventories $ 3,200 $ 3,128
Employee salary and benefits 3,860 3,542
Insurance 562 759
Depreciation and amortization 10,029 14,448
Net operating loss carryforwards 44,057 44,094
General business credit carryforwards 11,897 10,987
Reserves not currently deductible 5,420 6,315
Gross deferred tax assets 79,025 83,273
Less: Valuation allowance (71,790) (78,211)
Deferred tax assets less valuation allowance 7,235 5,062
Deferred tax liabilities:    
Depreciation and amortization (29,615) (35,845)
Basis difference - equity investee (31,016) (31,016)
Other (4,315) (1,600)
Gross deferred tax liabilities (64,946) (68,461)
Net deferred tax liability $ (57,711) $ (63,399)