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Warranty (Tables)
 6 Months Ended
Jun. 30, 2017
Product Warranties Disclosures [Abstract]  
Changes in warranty reserve
The changes in warranty reserves for the six months ended June 30, 2017 and 2016 were as follows:
 
Six Months Ended
 
June 30
 
2017
 
2016
Beginning balance
$
10,960

 
$
10,093

Additions charged to expense
5,815

 
5,946

Acquired warranty obligations
384

 
—

Foreign currency fluctuations
154

 
48

Claims paid
(5,872
)
 
(5,766
)
Ending balance
$
11,441

 
$
10,321