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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Information Regarding Restricted Shares
The following table summarizes information regarding Restricted Shares:
 
Six Months Ended June 30, 2014
 
Shares
 
Weighted Average
Grant-Date Fair
Value
Number of unvested shares:
 
 
 
Outstanding - January 1, 2014
2,020,678

 
$
44.68

Granted
486,484

 
72.30

Vested
(778,643
)
 
44.24

Canceled
(71,977
)
 
50.93

Outstanding - June 30, 2014
1,656,542

 
$
52.72