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STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 27, 2015
Mar. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Total stock-based compensation expense $ 3.4us-gaap_AllocatedShareBasedCompensationExpense $ 2.9us-gaap_AllocatedShareBasedCompensationExpense