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Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Product Warranties Disclosures [Abstract]    
Beginning balance $ 966 $ 934
Warranty provisions 59 53
Warranty claims (103) (173)
Adjustments to preexisting warranties (151) (81)
Ending balance $ 771 $ 733