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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of changes in the warranty reserve
Changes in the warranty reserve are as follows (in thousands):
 
2017
 
2016
 
2015
Balance, beginning of the year
$
8,906

 
$
8,513

 
$
8,180

Provision for warranty claims
7,099

 
6,792

 
7,249

Warranty claims paid
(6,735
)
 
(6,272
)
 
(6,801
)
Foreign currency translation adjustment
(96
)
 
(127
)
 
(115
)
Balance, end of the year
$
9,174

 
$
8,906

 
$
8,513