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Warranty (Tables)
 6 Months Ended
Jun. 30, 2016
Product Warranties Disclosures [Abstract]  
Changes in warranty reserve
The changes in warranty reserves for the six months ended June 30, 2016 and 2015 were as follows:
 
Six Months Ended
 
June 30
 
2016
 
2015
Beginning balance
$
10,093

 
$
9,686

Additions charged to expense
5,946

 
5,670

Foreign currency fluctuations
48

 
(118
)
Claims paid
(5,766
)
 
(5,209
)
Ending balance
$
10,321

 
$
10,029