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EMPLOYEE STOCK PLANS - Schedule of Stock Option Activity - Supplemental Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]    
Weighted-average fair value of options granted (in usd per share) $ 1.70 $ 1.24
Intrinsic value of options exercised $ 2,013 $ 358
Cash received from options exercised $ 1,588 $ 256