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

 
$
44.68

Granted
493,309

 
72.31

Vested
(778,843
)
 
44.24

Canceled
(94,495
)
 
51.13

Outstanding - September 30, 2014
1,640,649

 
$
52.82