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Accrued Liabilities
 12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]  
Accrued Liabilities Accrued Liabilities
At December 31, accrued liabilities were comprised of the following:
 December 31,
 20192018
 (in thousands)
Warranty$12,652  $11,421  
Due to representatives11,538  11,024  
Payroll5,058  4,182  
Profit sharing1,721  1,255  
Workers' compensation522  567  
Medical self-insurance707  1,207  
Customer prepayments4,627  2,367  
Donations354  150  
Employee vacation time3,804  3,173  
Other3,286  1,529  
     Total$44,269  $36,875