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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of changes in the warranty Reserve
Changes in the warranty reserve are as follows (in thousands):
 
2018
 
2017
 
2016
Balance, beginning of the year
$
9,174

 
$
8,906

 
$
8,513

Provision for warranty claims
7,726

 
7,099

 
6,792

Warranty claims incurred
(7,898
)
 
(6,735
)
 
(6,272
)
Warranties acquired through business acquisition
611

 
—

 
—

Foreign currency translation adjustment
10

 
(96
)
 
(127
)
Balance, end of the year
$
9,623

 
$
9,174

 
$
8,906