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Warranty (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 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 7,227 5,815
Acquired warranty obligations 0 384
Foreign currency fluctuations (153) 154
Claims paid (6,491) (5,872)
Ending balance $ 13,259 $ 11,441