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CONTINGENCIES (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2018 and 2017 (in thousands):
 
Nine Months Ended September 30,
 
2018
 
2017
Accrual balance at beginning of year
$
2,545

 
$
2,518

Accruals for product warranties
1,612

 
1,872

Costs of warranty claims
(1,802
)
 
(1,897
)
Accrual balance at end of period
$
2,355

 
$
2,493