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STOCK-BASED COMPENSATION (Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Stock Options (Number of shares)  
Outstanding, beginning balance (in shares) 2,078,433
Granted (in shares) 328,300
Exercised (in shares) (190,400)
Forfeited (in shares) (18,400)
Expired (in shares) 0
Outstanding, ending balance (in shares) 2,197,933
Vested and Expected to Vest, (in shares) 2,132,918
Exercisable, (in shares) 1,274,144
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) $ 59.27
Exercised (in dollars per share) $ 19.75
Forfeited (in dollars per share) $ 30.09
Expired (in dollars per share) $ 0.00
Weighted- average exercise price per share ending balance shares outstanding (in dollars per share) $ 31.61
Weighted- average exercise price per share, Vested and Expected to Vest (in dollars per share) $ 31.22
Weighted- average exercise price per share, Exercisable (in dollars per share) $ 22.67
Weighted-average remaining contractual terms (years), Outstanding 6 years 8 months 9 days
Weighted-average remaining contractual terms (years), Vested and Expected to Vest 6 years 7 months 13 days
Weighted-average remaining contractual terms (years), Exercisable 5 years 1 month 17 days
Aggregate intrinsic value, Outstanding $ 57,051
Aggregate intrinsic value, Vested and Expected to Vest 56,167
Aggregate intrinsic value, Exercisable $ 44,083