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STOCK-BASED COMPENSATION (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
May 31, 2011
Aggregate Share Based Compensation Disclosures    
Minimum number of full trading days 2 days  
Stock Options
    
Stock-based compensation    
Expiration period 7 years  
Vesting of awards per anniversary or year (as a percent) 33.33%  
Number of anniversaries of grant date on which awards will vest 3  
Weighted average fair value at date of grant (in dollars per share) $ 5.74  
Weighted average assumptions    
Expected life 4 years 6 months  
Risk-free interest rate (as a percent) 0.78%  
Volatility (as a percent) 47.96%  
Dividend yield (as a percent) 0.00%  
Stock Options    
Options outstanding at the beginning of the period (in shares) 3,271,000  
Granted (in shares) 153,000  
Exercised (in shares) (7,000)  
Cancelled (in shares) (788,000)  
Options outstanding at the end of the period (in shares) 2,629,000  
Options exercisable at the end of the period (in shares) 1,688,000  
Weighted Average Exercise Price    
Options outstanding at the beginning of the period (in dollars per share) $ 27.39  
Granted (in dollars per share) $ 14.36  
Exercised (in dollars per share) $ 16.14  
Cancelled (in dollars per share) $ 27.96  
Options outstanding at end of period, (in dollars per share) $ 26.49  
Options exercisable at the end of period (in dollars per share) $ 34.11  
Weighted Average Remaining Life    
Outstanding at the end of the period 4 years 9 months 18 days  
Exercisable at the end of the period 3 years 2 months 12 days  
Aggregate Intrinsic Value    
Outstanding at the end of the period (in USD) $ 8,870,000  
Exercisable at the end of the period (in USD) 2,435,000  
Unrecognized compensation    
Unrecognized compensation cost related to unvested stock options (in USD) 3,200,000  
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 10 months 24 days  
Restricted Stock, Restricted Stock Units, Cash Settled Restricted Stock Units and Cash Settled Performance Awards
    
Stock-based compensation    
Vesting of awards per anniversary or year (as a percent) 33.33%  
Number of anniversaries of grant date on which awards will vest 3  
Unrecognized compensation    
Weighted average period over which unrecognized compensation cost is expected to be recognized 2 years  
Shares    
Non-vested awards at the beginning of the period (in shares) 1,670,000  
Granted (in shares) 1,219,000  
Vested (in shares) (654,000)  
Cancelled (in shares) (145,000)  
Non-vested awards at the end of the period (in shares) 2,090,000  
Weighted Average Grant-Date Fair Value Per Share    
Non-vested awards at the beginning of the period (in dollars per share) $ 19.49  
Granted (in dollars per share) $ 14.32  
Vested (in dollars per share) $ 20.53  
Cancelled (in dollars per share) $ 23.19  
Non-vested awards at the end of the period (in dollars per share) $ 15.89  
Unrecognized compensation cost related to unvested restricted stock, restricted stock units, cash settled restricted stock units, cash settled performance awards and phantom units (in USD) 25,700,000  
Partnership Phantom Units
    
Stock-based compensation    
Number of shares authorized and reserved for issuance 1,035,378  
Unrecognized compensation    
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 10 months 24 days  
Shares    
Non-vested awards at the beginning of the period (in shares) 75,267,000  
Granted (in shares) 22,340,000  
Vested (in shares) (31,701,000)  
Cancelled (in shares) (771,000)  
Non-vested awards at the end of the period (in shares) 65,135,000  
Weighted Average Grant-Date Fair Value Per Share    
Non-vested awards at the beginning of the period (in dollars per share) $ 21.45  
Granted (in dollars per share) $ 23.38  
Vested (in dollars per share) $ 17.97  
Cancelled (in dollars per share) $ 28.50  
Non-vested awards at the end of the period (in dollars per share) $ 23.75  
Unrecognized compensation cost related to unvested restricted stock, restricted stock units, cash settled restricted stock units, cash settled performance awards and phantom units (in USD) 1,100,000  
Stock Incentive Plan
    
Stock-based compensation    
Number of shares authorized and reserved for issuance   12,500,000
Stock Incentive Plan | Stock Options and Stock Appreciation Rights
    
Stock-based compensation    
Number of shares counted by each award 1  
Stock Incentive Plan | Restricted Stock and Restricted Stock Units
    
Stock-based compensation    
Number of shares counted by each award 2  
Employee Stock Purchase Plan
    
Stock-based compensation    
Number of shares authorized and reserved for issuance   1,000,000
Employee stock purchase plan    
Amount for Employee stock purchase plan (in USD) $ 25,000  
Percentage of Employee stock purchase plan 10.00%  
Remaining shares available for purchase under ESPP 353,897  
Employee Stock Purchase plan discount from market price (as a percent) 5.00%  
Employee Stock Purchase Plan | Minimum
    
Employee stock purchase plan    
Purchase price as a percent of the fair market value 85.00%  
Employee Stock Purchase Plan | Maximum
    
Employee stock purchase plan    
Purchase price as a percent of the fair market value 100.00%