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Warranty (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 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 10,883 8,879
Acquired warranty obligations 0 384
Foreign currency fluctuations (193) 225
Claims paid (9,805) (8,912)
Ending balance $ 13,561 $ 11,536