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

 
$
9,663

Additions charged to expense
8,659

 
7,789

Foreign currency fluctuations
(175
)
 
(123
)
Claims paid
(8,055
)
 
(7,799
)
Ending balance
$
10,115

 
$
9,530