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STOCK-BASED EMPLOYEE COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Activity of unvested restricted stock units and performance share units
The following table summarizes the activity of unvested restricted stock units and performance share units ("Share-Based Awards") during the three months ended March 31, 2013: 
Share-Based Awards
 
Shares
 
Weighted Average
Grant Date Fair Value
Unvested at December 31, 2012
 
540,128

 
$
389.21

Granted
 
136,046

 
$
695.62

Vested
 
(249,330
)
 
$
244.48

Performance Share Units Adjustment
 
6,241

 
$
704.26

Forfeited
 
(4,107
)
 
$
463.15

Unvested at March 31, 2013
 
428,978

 
$
574.38