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STOCK-BASED COMPENSATION (Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 29, 2013
Stock Options (Number of shares)  
Outstanding, beginning balance (in shares) 2,078,433
Granted (in shares) 338,600
Exercised (in shares) (605,350)
Forfeited (in shares) (27,400)
Expired (in shares) 0
Outstanding, ending balance (in shares) 1,784,283
Vested and Expected to Vest, (in shares) 1,719,751
Exercisable, (in shares) 871,319
Stock Options (Weighted-average exercise price)  
Weighted- average exercise price per share beginning balance (in dollars per share) $ 26.14
Granted (in dollars per share) $ 59.47
Exercised (in dollars per share) $ 18.52
Forfeited (in dollars per share) $ 33.52
Expired (in dollars per share) $ 0.00
Weighted- average exercise price per share ending balance shares outstanding (in dollars per share) $ 34.94
Weighted- average exercise price per share, Vested and Expected to Vest (in dollars per share) $ 34.57
Weighted- average exercise price per share, Exercisable (in dollars per share) $ 25.04
Weighted-average remaining contractual terms (years), Outstanding 7 years 4 months 24 days
Weighted-average remaining contractual terms (years), Vested and Expected to Vest 7 years 4 months 6 days
Weighted-average remaining contractual terms (years), Exercisable 6 years 1 month 10 days
Aggregate intrinsic value, Outstanding $ 69,817
Aggregate intrinsic value, Vested and Expected to Vest 67,934
Aggregate intrinsic value, Exercisable $ 42,718