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Warranty (Tables)
 6 Months Ended
Jun. 30, 2014
Product Warranties Disclosures [Abstract]  
Changes in warranty reserve
The changes in warranty reserves for the six months ended June 30, 2014 and 2013 were as follows:
 
Six Months Ended
 
June 30
 
2014
 
2013
Beginning balance
$
9,663

 
$
9,357

Additions charged to expense
5,127

 
5,578

Foreign currency fluctuations
33

 
(132
)
Claims paid
(4,916
)
 
(5,055
)
Ending balance
$
9,907

 
$
9,748