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Accrued Liabilities (Tables)
 9 Months Ended
Sep. 30, 2020
Payables and Accruals [Abstract]  
Accrued Liabilities
Accrued liabilities were comprised of the following:

 September 30,
2020		December 31, 2019
 (in thousands)
Warranty$13,527 $12,652 
Due to representatives10,257 11,538 
Payroll7,448 5,058 
Profit sharing3,000 1,721 
Worker's compensation646 522 
Medical self-insurance247 707 
Customer prepayments2,151 4,627 
Donations604 354 
Employee vacation time3,493 3,804 
Other4,095 3,286 
Total
$45,468 $44,269