STOCK PLANS AND SHARE-BASED COMPENSATION (Performance-based Awards and Restricted Stock Units) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012 years	Sep. 30, 2011	Sep. 30, 2012 years	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense		$ (700,000)
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
Stock compensation expense	400,000	(700,000)	1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding, shares, at January 1, 2012			0
Outstanding, weighted-average grant date fair value per share, at January 1, 2012			$ 0.00
Granted, shares			102,000
Granted, weighted-average grant date fair value per share		$ 30.58	$ 37.60	$ 36.57
Vested, shares			0
Vested, weighted-average grant date fair value per share			$ 0.00
Forfeited or expired, shares			0
Forfeited or expired, weighted-average grant date fair value per share	$ 0.00		$ 0.00
Outstanding, shares, at September 30, 2012, 2012	102,000		102,000
Outstanding, weighted-average grant date fair value per share, at September 30, 2012	$ 37.60		$ 37.60
Outstanding and expected to vest, weighted-average remaining contractual term, at September 30, 2012 (in years)			0.25
Outstanding, aggregate intrinsic value, at September 30, 2012	3,091,000		3,091,000
Outstanding and expected to vest at September 30, 2012	62,000		62,000
Outstanding and expected to vest, weighted-average remaining contractual term, at September 30, 2012 (in years)	0.25		0.25
Grant date fair value of awards released				3,000,000
Outstanding and expected to vest, aggregate intrinsic value, at September 30, 2012	1,895,000		1,895,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction in number of shares available for issuance under the 2007 Plan per award granted			2
Stock compensation expense	2,000,000	1,100,000	5,100,000	2,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding, shares, at January 1, 2012			458,000
Outstanding, weighted-average grant date fair value per share, at January 1, 2012			$ 36.08
Granted, shares			281,000
Granted, weighted-average grant date fair value per share	$ 37.05	$ 33.21	$ 41.54	$ 36.16
Vested, shares			(113,000)
Vested, weighted-average grant date fair value per share			$ 36.33
Forfeited or expired, shares			(17,000)
Forfeited or expired, weighted-average grant date fair value per share	$ 36.99		$ 36.99
Outstanding, shares, at September 30, 2012, 2012	609,000		609,000
Outstanding, weighted-average grant date fair value per share, at September 30, 2012	$ 37.59		$ 37.59
Outstanding and expected to vest, weighted-average remaining contractual term, at September 30, 2012 (in years)			1.62
Outstanding, aggregate intrinsic value, at September 30, 2012	18,534,000		18,534,000
Outstanding and expected to vest at September 30, 2012	563,000		563,000
Outstanding and expected to vest, weighted-average remaining contractual term, at September 30, 2012 (in years)	1.60		1.60
Grant date fair value of awards released	300,000	200,000	4,100,000	2,100,000
Outstanding and expected to vest, aggregate intrinsic value, at September 30, 2012	$ 17,139,000		$ 17,139,000