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SHARE-BASED COMPENSATION (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
SHARE-BASED COMPENSATION            
Share-based compensation expense (in dollars) $ 1,100,000   $ 600,000 $ 900,000 $ 1,400,000  
Reversal of share-based compensation expense (in dollars)   800,000        
Stock based compensation            
Outstanding (in shares) 3,105,974     3,105,974   3,243,958
Stock options granted (in shares)       198,500 100,000  
Average exercise price of stock options granted (in dollars per share)       $ 63.14 $ 29.99  
Assumptions used to determine the fair value of options as of the grant date            
Fair value (in dollars per share)       $ 16.86 $ 16.03  
Weighted-average fair value of stock options granted, and the total intrinsic value of stock options exercised            
Weighted-average fair value at grant date per share (in dollars per share)       $ 16.86 $ 16.03  
Intrinsic value of options exercised (in dollars)       8,339,000 2,855,000  
Fair value of options vested (in dollars)       973,000 788,000  
Estimated unrecognized compensation costs (in dollars) $ 4,900,000     $ 4,900,000    
Weighted-average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized       3 years    
Minimum
           
Weighted-average fair value of stock options granted, and the total intrinsic value of stock options exercised            
Estimated forfeiture rate (as a percent) 1.00%     1.00%    
Maximum
           
Weighted-average fair value of stock options granted, and the total intrinsic value of stock options exercised            
Estimated forfeiture rate (as a percent) 10.00%     10.00%    
Black-Scholes options pricing model
           
Assumptions used to determine the fair value of options as of the grant date            
Risk-free interest rate (as a percent)         2.20%  
Risk-free interest rate, minimum (as a percent)       0.97%    
Risk-free interest rate, maximum (as a percent)       1.17%    
Expected stock price volatility (as a percent)         48.00%  
Expected option life       6 years 3 months 6 years 3 months  
Fair value (in dollars per share)         $ 16.55  
Weighted-average fair value of stock options granted, and the total intrinsic value of stock options exercised            
Weighted-average fair value at grant date per share (in dollars per share)         $ 16.55  
Black-Scholes options pricing model | Minimum
           
Assumptions used to determine the fair value of options as of the grant date            
Expected stock price volatility (as a percent)       34.22%    
Fair value (in dollars per share)       $ 19.25    
Weighted-average fair value of stock options granted, and the total intrinsic value of stock options exercised            
Weighted-average fair value at grant date per share (in dollars per share)       $ 19.25    
Black-Scholes options pricing model | Maximum
           
Assumptions used to determine the fair value of options as of the grant date            
Expected stock price volatility (as a percent)       34.65%    
Fair value (in dollars per share)       $ 22.80    
Weighted-average fair value of stock options granted, and the total intrinsic value of stock options exercised            
Weighted-average fair value at grant date per share (in dollars per share)       $ 22.80    
Lattice (binomial) model
           
Assumptions used to determine the fair value of options as of the grant date            
Risk-free interest rate, minimum (as a percent)       0.08% 0.03%  
Risk-free interest rate, maximum (as a percent)       2.04% 3.18%  
Expected stock price volatility (as a percent)         55.90%  
Contractual life       14 years 14 years  
Lattice (binomial) model | Minimum
           
Assumptions used to determine the fair value of options as of the grant date            
Expected stock price volatility (as a percent)       34.20%    
Fair value (in dollars per share)       $ 11.65 $ 18.09  
Weighted-average fair value of stock options granted, and the total intrinsic value of stock options exercised            
Weighted-average fair value at grant date per share (in dollars per share)       $ 11.65 $ 18.09  
Lattice (binomial) model | Maximum
           
Assumptions used to determine the fair value of options as of the grant date            
Expected stock price volatility (as a percent)       34.60%    
Fair value (in dollars per share)       $ 17.27 $ 18.76  
Weighted-average fair value of stock options granted, and the total intrinsic value of stock options exercised            
Weighted-average fair value at grant date per share (in dollars per share)       $ 17.27 $ 18.76  
Service-based Options
           
Stock based compensation            
Vesting period       4 years    
Expiration term       10 years    
Outstanding (in shares) 900,000     900,000    
Market-based Options
           
Stock based compensation            
Outstanding (in shares) 2,200,000     2,200,000    
Number of components of an award       2    
Vesting percentage for awards that vest upon achievement of criteria       25.00%    
Cumulative vesting percentage for awards that vest in equal annual installments       75.00%    
Number of equal annual installments for vesting of award       3    
Ordinary performance grants
           
Stock based compensation            
Market-based options subject to ordinary performance achievement (as a percent)       0.67    
Ordinary performance grants | Minimum
           
Stock based compensation            
Percentage of compounded annual gain of stock price over exercise price required for the award to vest       20.00%    
Multiplier of stock price over exercise price as a condition for the award to vest       2    
Extraordinary performance grants
           
Weighted-average fair value of stock options granted, and the total intrinsic value of stock options exercised            
Market-based options subject to extraordinary performance achievement (as a percent)       33.00%    
Extraordinary performance grants | Minimum
           
Stock based compensation            
Percentage of compounded annual gain of stock price over exercise price required for the award to vest       25.00%    
Multiplier of stock price over exercise price as a condition for the award to vest       3