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STOCK-BASED COMPENSATION AND OTHER STOCK-BASED PAYMENTS (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock option activity
The following table summarizes stock option activity during the year ended December 31, 2012:
 
Stock Options
 
Shares
 
Weighted
Average
Exercise Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(000’s)
 
 
 
 
 
 
 
 
 
Outstanding at December 31, 2011
 
197,238

 
$
20.71

 
2.3 years
 
$
88,166

Exercised
 
(126,237
)
 
$
21.26

 
 
 
 

Expired
 
—

 
$
—

 
 
 
 

Outstanding at December 31, 2012
 
71,001

 
$
19.73

 
1.3 years
 
$
42,647
Activity of unvested restricted stock units and performance share units
The following table summarizes the activity of unvested restricted stock units ("RSUs") and performance share units during the years ended December 31, 2010, 2011 and 2012:
 
Share-Based Awards
 
Shares
Weighted Average  Grant
Date Fair Value
 
 
 
 
 
 
Unvested at December 31, 2009
 
1,488,854

 
$
90.82

 
 
 
 
 
 
 
Granted
 
179,101

 
$
236.66

 
Vested
 
(367,856
)
 
$
57.24

 
Performance Shares Adjustment
 
260,822

 
$
182.16

 
Forfeited
 
(30,274
)
 
$
120.80

 
Unvested at December 31, 2010
 
1,530,647

 
$
130.93

 
 
 
 
 
 
 
Granted
 
125,564

 
$
469.29

 
Vested
 
(858,019
)
 
$
113.37

 
Performance Shares Adjustment
 
73,710

 
$
496.34

 
Forfeited
 
(71,922
)
 
$
182.90

 
Unvested at December 31, 2011
 
799,980

 
$
231.87

 
 
 
 
 
 
 
Granted
 
95,062

 
$
643.12

 
Vested
 
(353,819
)
 
$
108.31

 
Performance Shares Adjustment
 
6,649

 
$
532.26

 
Forfeited
 
(7,744
)
 
$
444.18

 
Unvested at December 31, 2012
 
540,128

 
$
389.21