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CONTINGENCIES (Tables)
 9 Months Ended
Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]  
Product warranty accrual activity
The following table sets forth the activity in the product warranty accrual account for the nine months ended September 30, 2016 and 2015 (in thousands):
 
Nine Months Ended September 30,
 
2016
 
2015
Accrual balance at beginning of year
$
2,234

 
$
2,792

Accruals for product warranties
1,992

 
2,429

Costs of warranty claims
(1,872
)
 
(2,747
)
Accrual balance at end of period
$
2,354

 
$
2,474