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Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Product Warranty Liability [Line Items]    
Beginning balance $ 858 $ 1,223
Warranty provisions 80 26
Warranty claims (18) (74)
Adjustments to preexisting warranties (222) (107)
Currency (5) 4
Ending balance $ 693 $ 1,072
Minimum [Member]    
Product Warranty Liability [Line Items]    
Product Warranty Period 2 years  
Maximum [Member]    
Product Warranty Liability [Line Items]    
Product Warranty Period 5 years