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STOCK-BASED COMPENSATION (Details) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Stock Options
item
Jun. 30, 2012
Restricted Stock, Restricted Stock Units and Cash Settled Restricted Stock Units
item
Jun. 30, 2012
Partnership Phantom Units
May 31, 2011
Stock Incentive Plan
Aug. 31, 2007
Stock Incentive Plan
Jun. 30, 2012
Stock Incentive Plan
Stock Options and Stock Appreciation Rights
Jun. 30, 2012
Stock Incentive Plan
Restricted Stock and Restricted Stock Units
Jun. 30, 2012
Employee Stock Purchase Plan
May 31, 2011
Employee Stock Purchase Plan
Jun. 30, 2012
Employee Stock Purchase Plan
Minimum
Jun. 30, 2012
Employee Stock Purchase Plan
Maximum
Stock-based compensation                        
Number of shares authorized and reserved for issuance       1,035,378 12,500,000 9,750,000       1,000,000    
Number of shares counted by each award             1 2        
Expiration period   7 years                    
Vesting of awards per anniversary or year (as a percent)   33.33% 33.33%                  
Number of anniversaries of grant date on which awards will vest   3 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                    
Cancelled (in shares)   (603,000)                    
Options outstanding at the end of the period (in shares)   2,821,000                    
Options exercisable at the end of the period (in shares)   1,865,000                    
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                    
Cancelled (in dollars per share)   $ 25.56                    
Options outstanding at end of period, (in dollars per share)   $ 27.07                    
Options exercisable at the end of period (in dollars per share)   $ 33.51                    
Weighted Average Remaining Life                        
Outstanding at the end of the period   4 years 10 months 24 days                    
Exercisable at the end of the period   3 years 4 months 24 days                    
Aggregate Intrinsic Value                        
Outstanding at the end of the period   $ 1,395,000                    
Unrecognized compensation                        
Unrecognized compensation cost related to unvested stock options   3,800,000                    
Weighted average period over which unrecognized compensation cost is expected to be recognized   2 years 2 months 12 days 2 years 2 months 12 days 2 years 2 months 12 days                
Shares                        
Non-vested awards at the beginning of the period (in shares)     1,670,000 75,267,000                
Granted (in shares)     1,216,000 22,340,000                
Vested (in shares)     (632,000) (31,701,000)                
Cancelled (in shares)     (83,000) (771,000)                
Non-vested awards at the end of the period (in shares)     2,171,000 65,135,000                
Weighted Average Grant-Date Fair Value Per Share                        
Non-vested awards at the beginning of the period (in dollars per share)     $ 19.49 $ 21.45                
Granted (in dollars per share)     $ 14.31 $ 23.38                
Vested (in dollars per share)     $ 20.56 $ 17.97                
Cancelled (in dollars per share)     $ 21.21 $ 28.50                
Non-vested awards at the end of the period (in dollars per share)     $ 16.21 $ 23.72                
Unrecognized compensation cost related to unvested restricted stock, restricted stock units, cash settled restricted stock units and phantom units     27,400,000 1,200,000                
Aggregate Share Based Compensation Disclosures                        
Minimum number of full trading days 2 days                      
Employee stock purchase plan                        
Amount for Employee stock purchase plan                 $ 25,000      
Percentage of Employee stock purchase plan                 10.00%      
Purchase price as a percent of the fair market value                     85.00% 100.00%
Remaining shares available for purchase under ESPP                 393,696      
Employee Stock Purchase plan discount from market price (as a percent)                 5.00%