STOCK-BASED COMPENSATION (Details 3) (Restricted and deferred stock units, USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Shares
Outstanding at the beginning of the period (in shares)	716,907
Granted (in shares)	450,169
Vested and released (in shares)	(117,120)
Forfeited (in shares)	(13,721)
Outstanding at the end of the period (in shares)	1,036,235
Vested or expected to vest at the end of the period (in shares)	1,028,043
Weighted Average Remaining Contractual Terms
Outstanding at the end of the period	1 year 3 months 18 days
Vested or expected to vest at the end of the period	1 year 3 months 18 days
Weighted Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 27.86
Granted (in dollars per share)	$ 45.20
Vested and released (in dollars per share)	$ 25.58
Forfeited (in dollars per share)	$ 33.67
Outstanding at the end of the period (in dollars per share)	$ 35.57
Vested or expected to vest at the end of the period (in dollars per share)	$ 35.52
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 39.2
Vested or expected to vest at the end of the period (in dollars)	38.9
Total intrinsic value of share awards vested (in dollars)	$ 5.6	$ 15.3
Minimum
Aggregate Intrinsic Value
Vesting period	1 year
Maximum
Aggregate Intrinsic Value
Vesting period	3 years