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Warranty (Tables)
 3 Months Ended
Mar. 31, 2017
Product Warranties Disclosures [Abstract]  
Changes in warranty reserve
The changes in warranty reserves for the three months ended March 31, 2017 and 2016 were as follows:
 
Three Months Ended
 
March 31
 
2017
 
2016
Beginning balance
$
10,960

 
$
10,093

Additions charged to expense
2,072

 
2,488

Foreign currency fluctuations
50

 
60

Claims paid
(2,800
)
 
(2,766
)
Ending balance
$
10,282

 
$
9,875