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Stock-Based Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Information Regarding Restricted Shares
The following table summarizes information regarding Restricted Shares:
 
Three Months Ended March 31, 2017
 
Shares
 
Weighted Average
Grant-Date Fair
Value
Number of unvested shares:
 
 
 
Outstanding - January 1, 2017
1,259,275

 
$
50.77

Granted
523,235

 
50.49

Vested
(423,523
)
 
60.69

Canceled
(128,281
)
 
47.97

Outstanding as of March 31, 2017
1,230,706

 
$
47.53