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Product Warranty (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Product Warranties Disclosures [Abstract]      
Product Warranty Accrual $ 2,227   $ 1,880
Summary of product warranty activity      
Beginning balance 1,880 $ 1,853  
Charges to expense 1,044 538  
Costs incurred (697) (632)  
Ending balance $ 2,227 $ 1,759