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Warranty (Tables)
 6 Months Ended
Jun. 30, 2015
Product Warranties Disclosures [Abstract]  
Changes in warranty reserve
The changes in warranty reserves for the six months ended June 30, 2015 and 2014 were as follows:
 
Six Months Ended
 
June 30
 
2015
 
2014
Beginning balance
$
9,686

 
$
9,663

Additions charged to expense
5,670

 
5,127

Foreign currency fluctuations
(118
)
 
33

Claims paid
(5,209
)
 
(4,916
)
Ending balance
$
10,029

 
$
9,907