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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Payables and Accruals [Abstract]    
Warranty $ 7,352 $ 5,776
Due to representatives 9,480 9,439
Payroll 4,448 2,515
Profit sharing 1,389 1,337
Workers' compensation 665 928
Medical self-insurance 353 420
Customer prepayments 2,077 3,933
Employee benefits and other 2,786 2,230
Total $ 28,550 $ 26,578