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SHARE-BASED COMPENSATION - Restricted Stock Units Activity (Details) (Restricted stock units, USD $)
12 Months Ended
Dec. 31, 2011
Restricted stock units
 
Stock Units  
Balance, beginning of year 1,963,000
Granted 720,000
Vested (783,000)
Forfeited (161,000)
Balance, end of year 1,739,000
Nonvested restricted stock units that have met the requisite service period and will be released as identified in the grant terms 95,000
Weighted Average Grant Date Fair Value  
Balance, beginning of year $ 26.44
Granted $ 23.94
Vested $ 28.50
Forfeited $ 23.74
Balance, end of year $ 24.72