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Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
Schedule of Accrued Liabilities
Accrued liabilities consist of the following balances:
 
 
December 31,
(in thousands)
 
2017
 
2016
Salaries, wages and bonuses
 
$
27,073

 
$
19,368

Warranty
 
5,335

 
5,262

State taxes
 
905

 
2,284

Other
 
7,141

 
6,244

Accrued Liabilities
 
$
40,454

 
$
33,158