STOCK PLANS AND SHARE-BASED COMPENSATION (Performance-based Awards and Restricted Stock Units) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Performance Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of awards released	$ 3,200,000	$ 2,000,000
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%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding, shares, at January 1, 2014	100,000
Granted, shares	44,000
Vested, shares	(83,000)
Change in units due to performance achievement for PSUs vested in the year, shares	(17,000)
Forfeited or expired, shares	0
Outstanding, shares, at March 31, 2014	44,000
Outstanding and expected to vest at March 31, 2014	37,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, weighted-average grant date fair value per share, at January 1, 2014	$ 38.48
Granted, weighted-average grant date fair value per share	$ 58.55	$ 36.43
Vested, weighted-average grant date fair value per share	$ 38.48
Change in units due to performance achievement for PSUs vested in the year per share	$ 38.48
Forfeited or expired, weighted-average grant date fair value per share	$ 0.00
Outstanding, weighted-average grant date fair value per share, at March 31, 2014	$ 58.55
Weighted Average Remaining Contractual Term [Abstract]
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2014 (in years)	9 months
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2014 (in years)	9 months
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value, at March 31, 2014	2,868,000
Outstanding and expected to vest, aggregate intrinsic value, at March 31, 2014	2,466,000
Long-Term Performance-based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding, shares, at January 1, 2014	0
Granted, shares	47,000
Vested, shares	0
Forfeited or expired, shares	0
Outstanding, shares, at March 31, 2014	47,000
Outstanding and expected to vest at March 31, 2014	40,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, weighted-average grant date fair value per share, at January 1, 2014	$ 0.00
Granted, weighted-average grant date fair value per share	$ 57.76
Vested, weighted-average grant date fair value per share	$ 0.00
Forfeited or expired, weighted-average grant date fair value per share	$ 0.00
Outstanding, weighted-average grant date fair value per share, at March 31, 2014	$ 57.76
Weighted Average Remaining Contractual Term [Abstract]
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2014 (in years)	2 years 9 months
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2014 (in years)	2 years 9 months
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value, at March 31, 2014	3,072,000
Outstanding and expected to vest, aggregate intrinsic value, at March 31, 2014	2,629,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Grant date fair value of awards released	1,600,000	200,000
Reduction in number of shares available for issuance under the 2007 Plan per award granted	2.0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding, shares, at January 1, 2014	714,000
Granted, shares	86,000
Vested, shares	(46,000)
Forfeited or expired, shares	(4,000)
Outstanding, shares, at March 31, 2014	750,000
Outstanding and expected to vest at March 31, 2014	704,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, weighted-average grant date fair value per share, at January 1, 2014	$ 38.97
Granted, weighted-average grant date fair value per share	$ 57.05	$ 35.68
Vested, weighted-average grant date fair value per share	$ 35.93
Forfeited or expired, weighted-average grant date fair value per share	$ 39.47
Outstanding, weighted-average grant date fair value per share, at March 31, 2014	$ 41.21
Weighted Average Remaining Contractual Term [Abstract]
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2014 (in years)	1 year 5 months 8 days
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2014 (in years)	1 year 4 months 2 days
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value, at March 31, 2014	49,312,000
Outstanding and expected to vest, aggregate intrinsic value, at March 31, 2014	$ 46,280,000