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STOCK-BASED COMPENSATION - Components of Stock-based Compensation Expense (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 27, 2014
Jun. 28, 2013
Jun. 27, 2014
Jun. 28, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Document Period End Date     Jun. 27, 2014  
Total stock-based compensation $ 1,897 $ 1,714 $ 4,987 $ 4,594
Restricted and unrestricted stock and performance share units
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation 1,822 1,642 4,771 4,461
Stock options
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation 0 0 54 0
Employee stock purchase plan
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 75 $ 72 $ 162 $ 133