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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Stock-Based Compensation Plans [Abstract]  
Changes in Outstanding Stock Options
The following is a summary of the changes in outstanding stock options for the years ended December 31, 2015 and 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 December 31, 2014
  
9,875
   
10.99
   
0.4
 
Expired
  
—
   
—
   
—
 
Exercised
  
(9,875
)
  
10.99
   
—
 
Forfeited, other
  
—
   
—
   
—
 
Outstanding at December 31, 2015
  
—
  
$
—
   
—
 
             
Options exercisable at December 31, 2015
  
—
  
$
—
   
—
 
Restricted and Performance-Based Share Activity
Our restricted and performance-based share activity was as follows for the years ended December 31, 2015 and 2014:
 
  
Shares
  
Weighted Average
Grant Date Fair
Value per Share
 
Balance at December 31, 2013
  
630,600
  
$
19.47
 
Granted
  
256,443
   
32.22
 
Vested
  
(132,325
)
  
15.50
 
Forfeited
  
(5,700
)
  
18.77
 
Balance at December 31, 2014
  
749,018
   
24.62
 
Granted
  
211,950
   
31.79
 
Vested
  
(192,768
)
  
22.13
 
Forfeited
  
(9,650
)
  
29.30
 
Balance at December 31, 2015
  
758,550
  
$
27.19