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EMPLOYEE STOCK PLANS - Employee Stock Purchase Plan (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Stock Purchase Plan offering period   6 months    
Employee Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum employee subscription rate   15.00%    
Maximum number of shares per employee 4,000 2,000    
Exercise price, as a percent of fair market value of common stock on grant date   90.00%    
Number of shares reserved for issuance   6,200,000    
Number of shares available for future grant   2,600,000    
Shares issued in period   100,000 100,000 100,000
Average price of shares purchased, per share   $ 2.09 $ 1.23 $ 1.29