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STOCK-BASED COMPENSATION (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2011
Y
Options outstanding and exercisable by price range  
Options Outstanding, Number (in shares) 1,078,713
Options Exercisable, Number (in shares) 618,844
Range of exercise price per share from $19.73 to $34.33
  
Options outstanding and exercisable by price range  
Exercise price range, low end of range (in dollars per share) $ 19.73
Exercise price range, high end of range (in dollars per share) $ 34.33
Options Outstanding, Number (in shares) 126,354
Options Outstanding, Weighted Average Remaining Contractual Life (in years) 1.86
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 25.59
Options Exercisable, Number (in shares) 126,354
Options Exercisable Weighted Average Exercise Price (in dollars per share) $ 25.59
Range of exercise price per share from $40.21 to $60.97
  
Options outstanding and exercisable by price range  
Exercise price range, low end of range (in dollars per share) $ 40.21
Exercise price range, high end of range (in dollars per share) $ 60.97
Options Outstanding, Number (in shares) 255,880
Options Outstanding, Weighted Average Remaining Contractual Life (in years) 3.40
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 56.66
Options Exercisable, Number (in shares) 235,980
Options Exercisable Weighted Average Exercise Price (in dollars per share) $ 56.90
Range of exercise price per share from $64.36 to $99.13
  
Options outstanding and exercisable by price range  
Exercise price range, low end of range (in dollars per share) $ 64.36
Exercise price range, high end of range (in dollars per share) $ 99.13
Options Outstanding, Number (in shares) 684,250
Options Outstanding, Weighted Average Remaining Contractual Life (in years) 5.64
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 83.74
Options Exercisable, Number (in shares) 256,510
Options Exercisable Weighted Average Exercise Price (in dollars per share) $ 83.59
Range of exercise price per share from $105.44 to $110.26
  
Options outstanding and exercisable by price range  
Exercise price range, low end of range (in dollars per share) $ 105.44
Exercise price range, high end of range (in dollars per share) $ 110.26
Options Outstanding, Number (in shares) 12,229
Options Outstanding, Weighted Average Remaining Contractual Life (in years) 6.25
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 109.04