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Warranty (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Product Warranties Disclosures [Abstract]    
Warranty terms, minimum 1 year  
Warranty terms, maximum 4 years  
Period of time following a sale the majority of claims are paid, min 6 months  
Period of time following a sale the majority of claims are paid, max 9 months  
Changes in warranty reserves    
Beginning balance $ 9,686 $ 9,663
Additions charged to expense 5,670 5,127
Foreign currency fluctuations (118) 33
Claims paid (5,209) (4,916)
Ending balance $ 10,029 $ 9,907