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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Awards
A summary of these awards as of June 30, 2013, along with the changes during the six months then ended follows:
 
 
Awards
 
Weighted Average
Grant Date
Fair Value
Nonvested at December 31, 2012
 
1,023,350

 
$
38.19

Granted
 
261,786

 
59.17

Vested
 
(120,300
)
 
35.84

Forfeited
 
(42,920
)
 
42.50

Nonvested at June 30, 2013
 
1,121,916

 
$
43.19