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Stock-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock Awards
 
 
Awards
 
Weighted Average
Grant Date
Fair Value
Nonvested at December 31, 2013
 
933,740

 
$
49.87

Granted
 
315,090

 
69.85

Vested
 
(283,970
)
 
42.44

Forfeited
 
(53,510
)
 
53.70

Nonvested at December 31, 2014
 
911,350

 
$
58.86