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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016
 
Shares
 
Weighted Average
Grant-Date Fair
Value
Number of unvested shares:
 
 
 
Outstanding - January 1, 2016
1,540,843

 
$
58.14

Granted
885,165

 
39.44

Vested
(695,843
)
 
54.81

Canceled
(114,502
)
 
52.55

Outstanding - June 30, 2016
1,615,663

 
$
49.72