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Warranty (Tables)
 9 Months Ended
Sep. 30, 2016
Product Warranties Disclosures [Abstract]  
Changes in warranty reserve
The changes in warranty reserves for the nine months ended September 30, 2016 and 2015 were as follows:
 
Nine Months Ended
 
September 30
 
2016
 
2015
Beginning balance
$
10,093

 
$
9,686

Additions charged to expense
8,888

 
8,659

Foreign currency fluctuations
85

 
(175
)
Claims paid
(8,707
)
 
(8,055
)
Ending balance
$
10,359

 
$
10,115