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CONTINGENCIES (Tables)
 3 Months Ended
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Product warranty accrual activity
The following table sets forth the activity in the product warranty accrual account for the three months ended March 31, 2017 and 2016 (in thousands):
 
Three Months Ended March 31,
 
2017
 
2016
Accrual balance at beginning of year
$
2,518

 
$
2,234

Accruals for product warranties
806

 
455

Costs of warranty claims
(634
)
 
(455
)
Accrual balance at end of period
$
2,690

 
$
2,234