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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 2015:
 
  
Shares
  
Weighted
Average
Exercise Price
  
Weighted Average
Remaining Contractual
Term (Years)
 
       
Outstanding at December 31, 2014
  
9,875
  
$
10.99
   
0.4
 
Expired
  
—
   
—
   
—
 
Exercised
  
(9,875
)
  
10.99
   
—
 
Forfeited, other
  
—
   
—
   
—
 
Outstanding at June 30, 2015
  
—
  
$
—
   
—
 
             
Options exercisable at June 30, 2015
  
—
  
$
—
   
—
 
Restricted and Performance-based Share Activity
Our restricted and performance-based share activity was as follows for the six months ended June 30, 2015:
 
  
Shares
  
Weighted Average
Grant Date Fair
Value Per Share
 
Balance at December 31, 2014
  
749,018
  
$
24.62
 
Granted
  
7,000
   
35.07
 
Vested
  
(44,293
)
  
34.47
 
Forfeited
  
(2,675
)
  
25.00
 
Balance at June 30, 2015
  
709,050
  
$
24.10