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STOCK-BASED COMPENSATION (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
plan
Mar. 31, 2011
STOCK-BASED COMPENSATION    
Stock-based compensation plans 2  
Compensation expense on share-based plans $ 6,600,000 $ 3,800,000
Stock options
    
Weighted-average assumptions used to estimate the fair value of options granted    
Dividend yield (as a percent) 0.00% 0.00%
Expected volatility (as a percent) 48.30% 55.90%
Risk-free interest rate (as a percent) 0.90% 2.00%
Expected term (in years) 5.5 6.1
Stock Options, Number of Shares    
Balance at the beginning of the period (in shares) 18,569  
Granted (in shares) 120  
Exercised (in shares) (1,920)  
Cancelled or forfeited (in shares) (97)  
Balance at the end of the period (in shares) 16,672  
Vested and expected to vest in the future at the end of the period (in shares) 16,060  
Exercisable at the end of the period (in shares) 12,547  
Stock options, Weighted-Average Exercise Price Per Share    
Balance at the beginning of the period (in dollars per share) $ 8.57  
Granted (in dollars per shares) $ 57.45  
Exercised (in dollars per share) $ 1.42  
Cancelled or forfeited (in dollars per share) $ 19.24  
Balance at the end of the period (in dollars per share) $ 9.68  
Vested and expected to vest in the future at the end of the period (in dollars per share) $ 9.14  
Exercisable at the end of the period (in dollars per share) $ 5.86  
Weighted-Average Remaining Contractual Term    
Balance at the beginning of the period (in years) 4.1  
Balance at the end of the period (in years) 4.3  
Vested and expected to vest in the future at the end of the period (in years) 4.1  
Exercisable at the end of the period (in years) 3.2  
Aggregate Intrinsic Value    
Balance at the beginning of the period 696,371,000  
Balance at the end of the period 873,781,000  
Vested and expected to vest in the future at the end of the period 850,404,000  
Exercisable at the end of the period $ 705,494,000