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CONTINGENCIES (Tables)
 6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Product warranty accrual activity
The following table sets forth the activity in the product warranty accrual account for the six months ended June 30, 2018 and 2017 (in thousands):
 
Six Months Ended June 30,
 
2018
 
2017
Accrual balance at beginning of year
$
2,545

 
$
2,518

Accruals for product warranties
1,073

 
1,304

Costs of warranty claims
(1,201
)
 
(1,261
)
Accrual balance at end of period
$
2,417

 
$
2,561