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STOCK PLANS AND SHARE BASED COMPENSATION (Fair Value Assumptions) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Y
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate, minimum 1.46% 1.53% 1.76%
Risk-free interest rate, maximum 2.20% 2.25% 2.47%
Expected volatility rates 44.00%    
Expected volatility rates, minimum   45.00% 39.00%
Expected volatility rates, maximum   48.00% 48.00%
Expected dividend yield, minimum 0.54% 0.54% 0.34%
Expected dividend yield, maximum 0.59% 0.62% 0.52%
Expected term of stock options/expected life of purchase right (in years) 6 5.12 5.01
Weighted-average grant date fair value of options granted/weighted-average estimated fair value of purchase rights (per share) $ 15.66 $ 14.82 $ 8.53
Employees Stock Purchase Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate, minimum 0.16% 0.17% 0.28%
Risk-free interest rate, maximum 0.17% 0.20% 0.39%
Expected volatility rates 37.00%    
Expected volatility rates, minimum   36.00% 35.00%
Expected volatility rates, maximum   43.00% 56.00%
Expected dividend yield, minimum 0.51% 0.52% 0.34%
Expected dividend yield, maximum 0.59% 0.55% 0.52%
Expected term of stock options/expected life of purchase right (in years) 0.5 0.5 0.5
Weighted-average grant date fair value of options granted/weighted-average estimated fair value of purchase rights (per share) $ 9.15 $ 8.65 $ 7.03