SHARE-BASED COMPENSATION - Performance Share Units Activity (Details) (Performance share units, USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Performance share units
Stock Units
Granted	326,000	0	0
Forfeited	(12,000)
Balance, end of year	314,000
Nonvested performance share units that have met the requisite service period and will be released as identified in the grant terms	33,000
Weighted Average Grant Date Fair Value
Granted	$ 25.52
Forfeited	$ 25.52
Balance, end of year	$ 25.52

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on 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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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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- Definition

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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