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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2014
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 nine months ended September 30, 2014:
  
Shares
  
Weighted Average Exercise Price
  
Weighted Average Remaining Contractual Term (Years)
 
       
Outstanding at December 31, 2013
  
16,875
  
$
12.14
   
1.0
 
Expired
  
—
   
—
   
—
 
Exercised
  
(7,000
)
  
13.76
   
—
 
Forfeited, other
  
—
   
—
   
—
 
Outstanding at September 30, 2014
  
9,875
  
$
10.99
   
0.6
 
             
Options exercisable at September 30, 2014
  
9,875
  
$
10.99
   
0.6
 
Restricted and Performance-based Share Activity
Our restricted and performance-based share activity was as follows for the nine months ended September 30, 2014:
 
 
Shares
  
Weighted Average Grant Date Fair Value Per Share
 
Balance at December 31, 2013
  
630,600
  
$
19.47
 
Granted
  
36,518
   
37.48
 
Vested
  
(127,325
)
  
14.98
 
Forfeited
  
(5,300
)
  
18.37
 
Balance at September 30, 2014
  
534,493
  
$
21.89