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Warranty (Tables)
3 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
Changes in warranty reserve
The changes in warranty reserves for the three months ended March 31, 2018 and 2017 were as follows:
 
Three Months Ended
 
March 31
 
2018
 
2017
Beginning balance
$
12,676

 
$
10,960

Additions charged to expense
3,334

 
2,072

Foreign currency fluctuations
86

 
50

Claims paid
(3,288
)
 
(2,800
)
Ending balance
$
12,808

 
$
10,282