STOCK PLANS AND SHARE BASED COMPENSATION (Performance-based Awards and Restricted Stock Units) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Released at End of Performance Year, Maximum Percentage of Targeted Number	200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments [Roll Forward]
Stock-based compensation expense	$ 14,224,000	$ 8,969,000	$ 10,721,000
Performance Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance-based awards shares released as percentage of target number, minimum	0.00%
Number of performance-based awards shares released as percentage of target number, maximum	200.00%
Reduction in number of shares available for issuance under the 2007 Plan per award granted	2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments [Roll Forward]
Outstanding, shares, beginning of period	0	85,000	119,000
Outstanding, weighted-average grant date fair value per share, beginning of period	$ 0.00	$ 34.97	$ 18.66
Granted, shares	102,000	98,000	92,000
Stock-based compensation expense	2,100,000		3,000,000
Granted, weighted-average grant date fair value per share	$ 37.60	$ 36.57	$ 34.85
Vested, shares	0	(85,000)	(121,000)
Vested, weighted-average grant date fair value per share	$ 0.00	$ 34.97	$ 18.81
Forfeited or expired, shares	0	(98,000)	(5,000)
Forfeited or expired, weighted-average grant date fair value per share	$ 0.00	$ 36.57	$ 33.59
Outstanding, shares, end of period	102,000	0	85,000
Outstanding, weighted-average grant date fair value per share, end of period	$ 37.60	$ 0.00	$ 34.97
Outstanding, weighted-average remaining contractual term (in years)	0 years
Outstanding, aggregate intrinsic value	3,421,000
Outstanding and expected to vest, shares	55,000
Outstanding and expected to vest, weighted-average remaining contractual term (in years)	0 years
Outstanding and expected to vest, aggregate intrinsic value	1,848,000
Grant date fair value of awards released		3,000,000	3,000,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	4 years
Reduction in number of shares available for issuance under the 2007 Plan per award granted	2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments [Roll Forward]
Outstanding, shares, beginning of period	458,000	260,000	13,000
Outstanding, weighted-average grant date fair value per share, beginning of period	$ 36.08	$ 36.30	$ 33.17
Granted, shares	293,000	296,000	259,000
Stock-based compensation expense	7,000,000	3,800,000	1,500,000
Granted, weighted-average grant date fair value per share	$ 41.06	$ 36.04	$ 36.44
Vested, shares	(152,000)	(64,000)	(4,000)
Vested, weighted-average grant date fair value per share	$ 36.48	$ 36.26	$ 33.94
Forfeited or expired, shares	(26,000)	(34,000)	(8,000)
Forfeited or expired, weighted-average grant date fair value per share	$ 36.92	$ 37.13	$ 36.94
Outstanding, shares, end of period	573,000	458,000	260,000
Outstanding, weighted-average grant date fair value per share, end of period	$ 38.21	$ 36.08	$ 36.30
Outstanding, weighted-average remaining contractual term (in years)	1 year 5 months 23 days
Outstanding, aggregate intrinsic value	19,270,000
Outstanding and expected to vest, shares	534,000
Outstanding and expected to vest, weighted-average remaining contractual term (in years)	1 year 5 months 19 days
Outstanding and expected to vest, aggregate intrinsic value	17,934,000
Grant date fair value of awards released	$ 5,500,000	$ 2,300,000	$ 200,000