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Product Warranty (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Product Warranties Disclosures [Abstract]      
Product Warranty Accrual $ 2,256   $ 1,880
Summary of product warranty activity      
Beginning balance 1,880 $ 1,853  
Charges to expense 1,543 811  
Costs incurred (1,167) (961)  
Ending balance $ 2,256 $ 1,703