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STOCK-BASED EMPLOYEE COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Activity of unvested restricted stock units, performance share units and restricted stock
The following table summarizes the activity of unvested restricted stock, restricted stock units and performance share units (“Share-Based Awards”) during the three months ended March 31, 2012: 
Share-Based Awards
 
Shares
 
Weighted Average
 Grant Date Fair Value
Unvested at December 31, 2011
 
799,980

 
$
231.87

Granted
 
90,192

 
$
645.86

Vested
 
(342,221
)
 
$
103.67

Performance Share Units Adjustment
 
323

 
$
464.79

Forfeited
 
(1,309
)
 
$
433.68

Unvested at March 31, 2012
 
546,965

 
$
380.00