STOCK PLANS AND SHARE-BASED COMPENSATION (Performance-based Awards and Restricted Stock Units) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012 years	Jun. 30, 2011	Jun. 30, 2012 years	Jun. 30, 2011
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 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	$ 42.68		$ 37.60	$ 36.90
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 June 30, 2012, 2012	102,000		102,000
Outstanding, weighted-average grant date fair value per share, at June 30, 2012, 2012	$ 37.60		$ 37.60
Outstanding, weighted-average remaining contractual term, at June 30, 2012 (in years)			0.5
Outstanding, aggregate intrinsic value, at June 30, 2012	$ 3,797,000		$ 3,797,000
Outstanding and expected to vest at June 30, 2012	79,000		79,000
Outstanding and expected to vest, weighted-average remaining contractual term, at June 30, 2012 (in years)	0.5		0.5
Vested and expected to vest, aggregate intrinsic value, at June 30, 2012	2,986,000		2,986,000
Grant date fair value of awards released				3,000,000
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
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			261,000
Granted, weighted-average grant date fair value per share	$ 41.97	$ 36.24	$ 41.88	$ 36.33
Vested, shares			(106,000)
Vested, weighted-average grant date fair value per share			$ 36.41
Forfeited or expired, shares			(9,000)
Forfeited or expired, weighted-average grant date fair value per share	$ 36.72		$ 36.72
Outstanding, shares, at June 30, 2012, 2012	604,000		604,000
Outstanding, weighted-average grant date fair value per share, at June 30, 2012, 2012	$ 38.52		$ 38.52
Outstanding, weighted-average remaining contractual term, at June 30, 2012 (in years)			1.86
Outstanding, aggregate intrinsic value, at June 30, 2012	22,541,000		22,541,000
Outstanding and expected to vest at June 30, 2012	553,000		553,000
Outstanding and expected to vest, weighted-average remaining contractual term, at June 30, 2012 (in years)	1.84		1.84
Vested and expected to vest, aggregate intrinsic value, at June 30, 2012	20,630,000		20,630,000
Grant date fair value of awards released	$ 3,700,000	$ 1,900,000	$ 3,800,000	$ 2,000,000