STOCK-BASED COMPENSATION (Details 2) (USD $)	6 Months Ended
Jun. 30, 2011
Share-based compensation costs
Compensation cost related to unvested granted awards not yet recognized	$ 28,876,000
Weighted average period of recognition of unrecognized compensation cost related to nonvested awards (in years)	2.67
Common Stock Options
Common Stock Options, Quantity
Outstanding at the beginning of the period (in shares)	7,426,499
Granted (in shares)	933,125
Exercised (in shares)	(335,681)
Forfeited (in shares)	(118,646)
Expired (in shares)	(73,125)
Outstanding at the end of the period (in shares)	7,832,172
Common Stock Options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 16.78
Granted (in dollars per share)	$ 18.88
Exercised (in dollars per share)	$ 15.37
Forfeited (in dollars per share)	$ 16.45
Expired (in dollars per share)	$ 15.21
Outstanding at the end of the period (in dollars per share)	$ 17.04
Nonvested Common Stock Options, Quantity
Nonvested Common Stock Options at the beginning of the period (in shares)	4,204,468
Granted (in shares)	933,125
Vested (in shares)	(1,311,940)
Forfeited (in shares)	(118,646)
Nonvested Common Stock Options at the end of the period (in shares)	3,707,007
Nonvested Common Stock Options, Weighted average grant-date fair value
Nonvested options at the beginning of the period (in dollars per share)	$ 10.97
Granted (in dollars per share)	$ 12.30
Vested (in dollars per share)	$ 11.50
Forfeited (in dollars per share)	$ 9.91
Nonvested options at the end of the period (in dollars per share)	$ 11.28
Equity-based incentive awards
Equity-based incentive awards, Quantity
Outstanding at the beginning of the period (in shares)	3,192,483
Granted (in shares)	512,500
Exercised (in shares)	(213,406)
Forfeited (in shares)	(69,688)
Outstanding at the end of the period (in shares)	3,421,889
Equity-based incentive awards, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 14.00
Granted (in dollars per share)	$ 14.00
Exercised (in dollars per share)	$ 14.00
Forfeited (in dollars per share)	$ 14.00
Outstanding at the end of the period (in dollars per share)	$ 14.00
Nonvested Equity-based incentive awards, Quantity
Outstanding at the beginning of the period (in shares)	2,276,667
Granted (in shares)	512,500
Vested (in shares)	(613,958)
Forfeited (in shares)	(69,688)
Outstanding at the end of the period (in shares)	2,105,521
Nonvested Equity-based incentive awards, Weighted average grant-date fair value
Outstanding at the beginning of the period (in dollars per share)	$ 2.80
Vested (in dollars per share)	$ 2.80
Forfeited (in dollars per share)	$ 2.80
Outstanding at the end of the period (in dollars per share)	$ 2.80

The weighted average exercise price of equity-based award plans other than stock (unit) option plans that were exercised during the reporting period.

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The weighted average grant date fair value of nonvested options that are outstanding as of the balance sheet date, under option plans.

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The decrease in the number of nonvested shares (or other type of equity) available under the option plan pertaining to awards for which the grantee has gained the right to receive or retain shares or units during the reporting period, by satisfying service and performance requirements.

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Number of exercises made during the period on plans other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting period.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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