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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Net operating losses $ 9,962 $ 23,043
Warranty reserve 11,406 6,306
Stock-based compensation 2,654 3,254
Accruals not currently deductible and other 8,193 3,959
Inventories 5,008 4,137
State tax credit carryforwards 4,105 4,252
Gross deferred tax assets, before valuation allowance 41,328 44,951
Valuation allowance (24,131) (24,199)
Gross deferred tax assets, after valuation allowance 17,197 20,752
Deferred tax liabilities:    
Debt discount   (2,103)
Depreciation and other (20,758) (21,592)
Gross deferred tax liabilities (20,758) (23,695)
Net deferred tax asset (liability) $ (3,561) $ (2,943)