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STOCK-BASED COMPENSATION (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Stock-based compensation            
Stock-based compensation plans       2    
Compensation expense on share-based plans $ 8,100,000   $ 7,400,000 $ 15,100,000 $ 14,400,000  
Stock options
            
Stock-based compensation            
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options 700,000   28,700,000 3,300,000 28,900,000  
Weighted-average assumptions used to estimate the fair value of options granted            
Dividend yield (as a percent) 0.00%   0.00% 0.00% 0.00%  
Expected volatility (as a percent) 37.40%   48.10% 42.40% 47.90%  
Risk-free interest rate (as a percent) 1.60%   1.00% 1.60% 0.90%  
Expected term 5 years 7 months 6 days   6 years 1 month 6 days 5 years 10 months 24 days 5 years 8 months 12 days  
Stock Options, Number of Shares            
Balance at the beginning of the period (in shares)   12,973   12,973    
Granted (in shares) 99 689        
Exercised (in shares)       (317)    
Cancelled or forfeited (in shares)       (62)    
Balance at the end of the period (in shares) 13,382     13,382   12,973
Vested and expected to vest in the future at the end of the period (in shares) 12,918     12,918    
Exercisable at the end of the period (in shares) 10,531     10,531    
Stock options, Weighted-Average Exercise Price Per Share            
Balance at the beginning of the period (in dollars per share)   $ 15.70   $ 15.70    
Granted (in dollars per share) $ 69.16 $ 70.06        
Exercised (in dollars per share)       $ 24.30    
Cancelled or forfeited (in dollars per share)       $ 45.18    
Balance at the end of the period (in dollars per share) $ 18.55     $ 18.55   $ 15.70
Vested and expected to vest in the future at the end of the period (in dollars per share) $ 17.22     $ 17.22    
Exercisable at the end of the period (in dollars per share) $ 10.15     $ 10.15    
Weighted-Average Remaining Contractual Term            
Balance at the beginning of the period       3 years 7 months 6 days   3 years 8 months 12 days
Balance at the end of the period       3 years 7 months 6 days   3 years 8 months 12 days
Vested and expected to vest in the future at the end of the period       3 years 4 months 24 days    
Exercisable at the end of the period       2 years 3 months 18 days    
Aggregate Intrinsic Value            
Balance at the beginning of the period   675,595,000   675,595,000    
Balance at the end of the period 702,248,000     702,248,000   675,595,000
Vested and expected to vest in the future at the end of the period 695,088,000     695,088,000    
Exercisable at the end of the period $ 641,150,000     $ 641,150,000