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Warranty (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Product Warranties Disclosures [Abstract]    
Machine warranty, range minimum (in years) 1 year  
Machine warranty, range maximum (in years) 4 years  
Period of time following a sale the majority of claims are paid, range minimum (in years) 6 months  
Period of time following a sale the majority of claims are paid, range maximum (in years) 9 months  
Changes in warranty reserves    
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