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CONTINGENCIES (Tables)
9 Months Ended
Sep. 30, 2019
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, 2019 and 2018 (in thousands):
 
Nine Months Ended September 30,
 
2019
 
2018
Accrual balance at beginning of year
$
1,706

 
$
2,545

Accruals for product warranties
732

 
1,612

Costs of warranty claims
(1,016
)
 
(1,802
)
Accrual balance at end of period
$
1,422

 
$
2,355