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Stock-Based Compensation Plans (Tables)
3 Months Ended
Mar. 31, 2015
Stock-Based Compensation Plans [Abstract]  
Summary of Changes in Outstanding Stock Options
The following is a summary of the changes in outstanding stock options for the three months ended March 31, 2015:
      
Weighted Average
 
      
Remaining
Contractual
 
  
Shares
  
Weighted
Average Exercise
Price
  
Term (Years)
 
       
Outstanding at December 31, 2014  
  
9,875
  
$
10.99
   
0.4
 
Expired  
  
   
   
 
Exercised  
  
(3,125
)
  
11.14
   
 
Forfeited, other  
  
   
   
 
Outstanding at March 31, 2015  
  
6,750
  
$
10.92
   
0.1
 
             
Options exercisable at March 31, 2015
  
6,750
  
$
10.92
   
0.1
 
Restricted and Performance-based Share Activity
Our restricted and performance-based share activity was as follows for the three months ended March 31, 2015:
  
   
 
 
Shares
  
Weighted Average Grant Date Fair Value Per Share
 
Balance at December 31, 2014                                                                                              
  
749,018
  
$
24.62
 
Granted                                                                                          
  
   
 
Vested                                                                                          
  
(30,343
)
  
36.14
 
Forfeited                                                                                          
  
(1,100
)
  
22.30
 
Balance at March 31, 2015                                                                                              
  
717,575
  
$
24.13