Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Gross [Abstract]
Warranty, insurance and other accruals	$ 8,218	$ 8,078
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	4,096	3,250
Inventory	4,441	4,720
State taxes	185	160
Net operating loss carryforward	3,240	6,193
Deferred charges	0	506
Total deferred tax assets	20,180	22,907
Deferred Tax Liabilities, Gross [Abstract]
Federal effect of state deferred taxes	1,079	1,777
Depreciation	4,801	2,382
Prepaid expenses	285	310
Deferred Tax Liabilities, Other	533	0
Total deferred tax liabilities	6,698	4,469
Deferred Tax Assets, Net of Valuation Allowance	$ 13,482	$ 18,438