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CONTINGENCIES (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015 and 2014 (in thousands):
 
Nine Months Ended September 30,
 
2015
 
2014
Accrual balance at beginning of year
$
2,792

 
$
3,501

Accruals for product warranties
2,429

 
4,943

Costs of warranty claims
(2,747
)
 
(5,018
)
Accrual balance at end of period
$
2,474

 
$
3,426