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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Stock-Based Compensation  
Summary of activity under the entity's stock option plans

The following table summarizes activity under our stock option plans (shares in thousands):

 
   Year Ended December 31,  
 
   2013   2012   2011  
Stock Options
  Shares   Weighted-
Average
Exercise Price		   Shares   Weighted-
Average
Exercise Price		   Shares   Weighted-
Average
Exercise Price		  

Outstanding at beginning of year

     1,143   $ 11.59     1,056   $ 10.84     1,061   $ 9.58  

Granted

     156   $ 13.86     190   $ 11.19     142   $ 13.87  

Exercised

     (440 ) $ 11.10     (103 ) $ 3.20     (66 ) $ 4.46  

Forfeited

     (1 ) $ 13.87     —   $ —     —   $ —  

Expired

     —   $ —     —   $ —     (81 ) $ 4.82  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at end of year

     858   $ 12.24     1,143   $ 11.59     1,056   $ 10.84  
                                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                                 

Options exercisable at end of year

     528           810           762        
Summary information about stock options outstanding

The following table summarizes information about stock options outstanding at December 31, 2013 (shares in thousands):

 
   Options Outstanding   Options Exercisable  
Range of Exercise Prices
  Number
Outstanding
at 12/31/13		   Weighted-
Average
Remaining
Contractual
Life		   Weighted-
Average
Exercise Price		   Number
Exercisable
at 12/31/13		   Weighted-
Average
Exercise Price		  

$6.38 - $7.94

     48     1.38   $ 6.40     48   $ 6.40  

$10.73 - $12.90

     447     6.31   $ 11.66     320   $ 11.84  

$13.15 - $15.03

     363     7.40   $ 13.73     160   $ 13.57  
                             
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

$6.38 - $15.03

     858     6.50   $ 12.24     528   $ 11.88  
                             
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                             
Schedule of fair values and the assumptions used for the grants

 

 
   Year Ended December 31,
 
   2013   2012   2011

Weighted-average fair value per share of options granted

   $5.06   $4.03   $5.04

Fair value assumptions:

            

Expected dividend yield

   1.82%   1.86%   1.70%

Expected stock price volatility

   46.6%   46.5%   44.2%

Risk-free interest rate

   0.96%   1.17%   2.24%

Expected term

   5.6 years   5.3 years   5.3 years
Summary of information about nonvested stock option awards and changes

The following table summarizes information about nonvested stock option awards as of December 31, 2013 and changes for the year ended December 31, 2013 (shares in thousands):

Stock Options
  Shares   Weighted-Average
Grant Date
Fair Value		  

Nonvested at December 31, 2012

     333   $ 4.40  

Granted

     156   $ 5.06  

Vested

     (158 ) $ 4.51  

Forfeited

     (1 ) $ 5.04  
             
​ ​ ​ ​ ​ ​ ​ ​

Nonvested at December 31, 2013

     330   $ 4.66  
             
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
             
Summary of activity under the entity's restricted stock plans

The following table summarizes activity under our restricted stock plans (shares in thousands):

 
   Shares  
Restricted Stock and Restricted Stock Units
  2013   2012   2011  

Unvested at beginning of year

     272     302     312  

Granted

     169     224     231  

Vested

     (240 )   (254 )   (241 )

Forfeited

     (2 )   —     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Unvested at end of year

     199     272     302  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​