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Warranty (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Product Warranties Disclosures [Abstract]          
Machine warranty, range minimum (in years) 1 year   1 year    
Machine warranty, range maximum (in years) 4 years   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 $ 10,960 $ 10,093 $ 10,093 $ 9,686 $ 9,663
Additions charged to expense 8,879 8,888 12,413 11,719 10,605
Acquired warranty obligations 384 0 42 0 0
Foreign currency fluctuations 225 85 82 (207) (215)
Claims paid (8,912) (8,707) (11,670) (11,105) (10,367)
Ending balance $ 11,536 $ 10,359 $ 10,960 $ 10,093 $ 9,686