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Product Warranty (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Product Warranties Disclosures [Abstract]      
Product Warranty Accrual $ 2,315   $ 2,280
Summary of product warranty activity      
Beginning balance 2,280 $ 1,880  
Charges to expense 845 1,543  
Costs incurred (810) (1,167)  
Ending balance $ 2,315 $ 2,256