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Long-Term Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Transactions Involving Stock Option Awards
Transactions involving stock option awards during 2012 under the 2000 Incentive Plan are summarized in the table below.
Stock Options:
 
Number of Shares
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term (in years)
 
Intrinsic Value (in thousands)
Outstanding at December 31, 2011
 
22,326,361

 
$
26.40

 
 
 
 
2012:
Granted
 
4,162,653

 
$
167.96

 
 
 
 
 
Forfeited
 
(226,698
)
 
$
38.98

 
 
 
 
 
Expired
 
(4,539
)
 
$
18.66

 
 
 
 
 
Exercised
 
(5,468,266
)
 
$
20.99

 
 
 
 
 
Outstanding at December 31, 2012
 
20,789,511

 
$
56.03

 
7.06
 
$
2,373,598

Vested and expected to vest at December 31, 2012
 
20,235,232

 
$
54.60

 
7.01
 
$
2,337,562

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2012
 
10,536,662

 
$
21.75

 
5.27
 
$
1,545,342
Weighted-Average Exercise Prices and Weighted-Average Grant-Date Fair Values of Options Issued
The fair value of each option granted under the 2000 Incentive Plan during 2012, 2011, and 2010 was estimated on the date of grant using the Black-Scholes option-pricing model.
 
 
Number of Options Granted
 
Weighted-Average Exercise Price
 
Weighted-Average Fair Value
2012:
 
 
 
 
 
 
Exercise price equal to Market Price
 
4,162,653

 
$
167.96

 
$
67.66

2011:
 
 
 
 
 
 
Exercise price equal to Market Price
 
4,286,640

 
$
51.96

 
$
23.82

2010:
 
 
 
 
 
 
Exercise price equal to Market Price
 
4,319,856

 
$
29.43

 
$
13.36
Weighted-Average Values of Assumptions Used in Computing Fair Value of Option Grants
The following table summarizes the weighted average values of the assumptions used in computing the fair value of option grants during 2012, 2011, and 2010.
 
 
2012
 
2011
 
2010
Expected volatility
 
45
%
 
48
%
 
47
%
Expected lives from grant date
 
5.4 years

 
6.1 years

 
5.6 years

Expected dividend yield
 
0
%
 
0
%
 
0
%
Risk-free interest rate
 
0.86
%
 
1.31
%
 
2.11
%
Activity Related to Restricted Stock Awards
A summary of the Company's activity related to Restricted Stock awards for the year ended December 31, 2012 is summarized below:
Restricted Stock:
Number of Shares
 
Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2011
 
751,499

 
$
25.33

2012:
Granted
 
501,000

 
$
114.60

 
Vested
 
(610,000
)
 
$
23.49

 
Outstanding at December 31, 2012
 
642,499

 
$
96.68