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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Warranty $ 8,469 $ 8,130
Due to representatives 10,597 10,188
Payroll 3,954 3,153
Other Employee Related Liabilities, Current 3,054 104
Profit sharing 2,220 2,016
Workers' compensation 366 535
Medical self-insurance 676 532
Customer prepayments 2,895 1,639
Donations 600 1,600
Employee benefits and other 4,404 3,446
Total $ 37,235 $ 31,343