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Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Product Warranties Disclosures [Abstract]    
Beginning balance $ 1,223 $ 760
Warranty provisions 10 71
Warranty claims (60) (95)
Adjustments to preexisting warranties (51) 24
Currency 2  
Ending balance $ 1,124 $ 760