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Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2014
Stock Option [Member]
 
Summary of stock options
 
Shares
(in thousands)
 
Weighted-Average
Exercise Price
Outstanding at December 31, 2013
5,227

 
$
54.11

Granted
261

 
140.78

Exercised
(683
)
 
43.53

Forfeited
(128
)
 
81.65

Outstanding at June 30, 2014
4,677

 
$
59.75

Exercisable at June 30, 2014
2,984

 
$
40.86


Black-Scholes option pricing model
 
For the Six Months Ended
June 30,
 
2014
 
2013
Risk free interest rate
1.65
%
 
 
0.85
%
 
Expected life
5.5

Years
 
5.2

Years
Expected volatility
25.2
%
 
 
32.3
%
 
Expected dividend yield
%
 
 
%
 

Summary of activity of share-based compensation
 
For the Three Months Ended
June 30,
 
For the Six Months Ended
June 30,
 
2014
 
2013
 
2014
 
2013
Compensation expense for stock options awarded
$
5,710

 
$
4,580

 
$
9,794

 
$
9,237

Income tax benefit from compensation expense related to stock options
2,113

 
1,747

 
3,625

 
3,524


Restricted Stock [Member] | Employee Stock Purchase Plan [Member]
 
Summary of activity of share-based compensation
 
For the Three Months Ended
June 30,
 
For the Six Months Ended
June 30,
 
2014
 
2013
 
2014
 
2013
Compensation expense for shares issued under the ESPP
$
443

 
$
418

 
$
881

 
$
831

Income tax benefit from compensation expense related to shares issued under the ESPP
164

 
160

 
326

 
317

Compensation expense for restricted shares awarded
889

 
579

 
1,462

 
1,106

Income tax benefit from compensation expense related to restricted awards
329

 
221

 
541

 
422