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Warranty (Tables)
 6 Months Ended
Jun. 30, 2013
Product Warranties Disclosures [Abstract]  
Changes in Warranty Reserve
The changes in warranty reserves for the six months ended June 30, 2013 and 2012 were as follows:
 
Six Months Ended
 
June 30

2013
 
2012
Beginning balance
$
9,357

 
$
8,759

Additions charged to expense
5,578

 
6,312

Foreign currency fluctuations
(132
)
 
(17
)
Claims paid
(5,055
)
 
(5,817
)
Ending balance
$
9,748

 
$
9,237