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Warranty (Tables)
6 Months Ended
Jun. 30, 2018
Product Warranties Disclosures [Abstract]  
Changes in warranty reserve
The changes in warranty reserves for the six months ended June 30, 2018 and 2017 were as follows:
 
Six Months Ended
 
June 30
 
2018
 
2017
Beginning balance
$
12,676

 
$
10,960

Additions charged to expense
7,227

 
5,815

Acquired warranty obligations

 
384

Foreign currency fluctuations
(153
)
 
154

Claims paid
(6,491
)
 
(5,872
)
Ending balance
$
13,259

 
$
11,441