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Product Warranty (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Product Warranties Disclosures [Abstract]      
Product Warranty Accrual $ 1,703   $ 1,853
Summary of product warranty activity      
Beginning balance 1,853 $ 1,269  
Charges to expense 811 1,447  
Costs incurred (961) (1,050)  
Ending balance $ 1,703 $ 1,666