STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Stock-based compensation
Aggregate amount of common stock authorized (in shares)	7,250,000			7,250,000
Reduction in number of shares for each share granted (in shares)	2.16			2.16
Shares available for grant (in shares)	7,193,200			7,193,200
Compensation expense on share-based plans	$ 4,100,000		$ 3,500,000	$ 7,900,000	$ 8,500,000
Stock Options, Number of Shares
Granted (in shares)				56,800
Stock options
Stock-based compensation
Vesting period (in years)				five
Tenure of award (in years)				10
Weighted-average assumptions used to estimate the fair value of options granted
Dividend yield (as a percent)	0.00%		0.00%	0.00%	0.00%
Expected volatility (as a percent)	53.60%		58.70%	54.80%	59.20%
Risk-free interest rate (as a percent)	1.70%		2.20%	1.90%	2.30%
Expected term (in years)	5.8		5.7	6.0	5.7
Stock Options, Number of Shares
Balance at the beginning of the period (in shares)		9,749,000		9,749,000
Granted (in shares)	52,000	59,000
Exercised (in shares)				(324,000)
Cancelled or forfeited (in shares)				(41,000)
Balance at the end of the period (in shares)	9,495,000			9,495,000
Vested and expected to vest in the future at the end of the period (in shares)	9,101,000			9,101,000
Exercisable at the end of the period (in shares)	7,113,000			7,113,000
Stock options, Weighted-Average Exercise Price Per Share
Balance at the beginning of the period (in dollars per share)		$ 17.18		$ 17.18
Granted (in dollars per shares)	$ 70.00	$ 57.61		$ 70.00
Exercised (in dollars per share)	$ 34.95			$ 34.95
Cancelled or forfeited (in dollars per share)				$ 37.00
Balance at the end of the period (in dollars per share)	$ 17.02			$ 17.02
Vested and expected to vest in the future at the end of the period (in dollars per share)	$ 16.05			$ 16.05
Exercisable at the end of the period (in dollars per share)	$ 9.90			$ 9.90
Weighted-Average Remaining Contractual Term
Balance at the beginning of the period (in years)		5.2		5.2
Balance at the end of the period (in years)	4.7			4.7
Vested and expected to vest in the future at the end of the period (in years)				4.5
Exercisable at the end of the period (in years)				3.5
Aggregate Intrinsic Value
Balance at the beginning of the period		342,241,000		342,241,000
Balance at the end of the period	606,950,000			606,950,000
Vested and expected to vest in the future at the end of the period	590,630,000			590,630,000
Exercisable at the end of the period	505,376,000			505,376,000
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 35.55		$ 21.85	$ 33.13	$ 21.91
Total intrinsic value of options exercised	7,000,000		500,000	9,500,000	21,300,000
Cash received from option exercises	7,100,000		500,000	11,300,000	5,000,000
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options	1,000,000		100,000	1,100,000	6,600,000
Total unrecognized compensation expense related to nonvested shares granted to both employees and non-employees	45,100,000			45,100,000
Cost expected to be recognized over a weighted-average period (in years)				3.0
Restricted stock units
Aggregate Intrinsic Value
Total unrecognized compensation expense related to nonvested shares granted to both employees and non-employees	$ 1,900,000			$ 1,900,000
Cost expected to be recognized over a weighted-average period (in years)				2.2
Number of Shares
Non-vested at the beginning of the period (in shares)		6,000		6,000
Granted (in shares)				28,000
Vested (in shares)				(8,000)
Non-vested at the end of the period (in shares)	26,000			26,000
Weighted Average Fair Value
Non-vested at the beginning of the period (in dollars per share)		$ 38.40		$ 38.40
Granted (in dollars per share)				$ 71.76
Vested (in dollars per share)				$ 69.66
Non-vested at the end of the period (in dollars per share)	$ 71.72			$ 71.72