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Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Assets, Gross [Abstract]    
Warranty, insurance and other accruals $ 12,738 $ 8,987
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 5,482 5,473
Inventory 8,223 9,528
State taxes 219 211
Net operating loss carryforward 8,483 42,556
Deferred charges 1,812 649
Total deferred tax assets 36,957 67,404
Deferred Tax Liabilities, Gross [Abstract]    
Federal effect of state deferred taxes 3,879 5,519
Depreciation 1,947 0
Prepaid expenses 256 0
Total deferred tax liabilities 6,082 5,519
Deferred Tax Assets, Net of Valuation Allowance $ 30,875 $ 61,885