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STOCK-BASED COMPENSATION (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Restricted and deferred stock units
   
Shares    
Outstanding at the beginning of the period (in shares) 716,907  
Granted (in shares) 89,637  
Vested and released (in shares) (3,975)  
Forfeited (in shares) (2,338)  
Outstanding at the end of the period (in shares) 800,231  
Vested or expected to vest at the end of the period (in shares) 769,748  
Weighted Average Remaining Contractual Terms    
Outstanding at the end of the period 1 year 3 months 18 days  
Vested or expected to vest at the end of the period 1 year 3 months 18 days  
Weighted Average Grant Date Fair Value    
Outstanding at the beginning of the period (in dollars per share) $ 27.86  
Granted (in dollars per share) $ 38.26  
Vested and released (in dollars per share) $ 17.62  
Forfeited (in dollars per share) $ 26.62  
Outstanding at the end of the period (in dollars per share) $ 29.08  
Vested or expected to vest at the end of the period (in dollars per share) $ 29.18  
Aggregate Intrinsic Value    
Outstanding at the end of the period (in dollars) $ 49.7  
Vested or expected to vest at the end of the period (in dollars) 47.8  
Total intrinsic value of share awards vested (in dollars) $ 0.2 $ 0.1
Restricted and deferred stock units | Minimum
   
Aggregate Intrinsic Value    
Vesting period 1 year  
Restricted and deferred stock units | Maximum
   
Aggregate Intrinsic Value    
Vesting period 3 years  
PRSUs | Minimum
   
Aggregate Intrinsic Value    
Percentage multiplied to target award for determining the number of shares subject to award 0.00%  
PRSUs | Maximum
   
Aggregate Intrinsic Value    
Percentage multiplied to target award for determining the number of shares subject to award 150.00%