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Share-Based Compensation (Tables)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Summary of nonvested stock activity


7.    Share-Based Compensation, continued
Nonvested Stock Activity
During the three and six months ended June 30, 2013, 12,052 shares of nonvested common stock were granted to our directors representing their annual grant. Assuming continued service through each vesting date, these awards will vest in three equal annual installments beginning May 2014 to May 2016.
Total compensation cost charged against income related to nonvested stock awards was $2.4 million and $3.3 million, for the three months ended June 30, 2013 and 2012, respectively. The corresponding income tax benefit recognized in the income statement was $940,000 and $1.3 million, for the three months ended June 30, 2013 and 2012, respectively.
Total compensation cost charged against income related to nonvested stock awards was $5.0 million and $7.0 million, for the six months ended June 30, 2013 and 2012, respectively. The corresponding income tax benefit recognized in the income statement was $1.9 million and $2.7 million, for the six months ended June 30, 2013 and 2012, respectively.
At June 30, 2013, there was $13.9 million of unrecognized compensation cost related to these nonvested shares, which will be recognized over a weighted-average period of 2.5 years. A summary of our nonvested stock activity for the six months ended June 30, 2013 is as follows (in thousands, except per share amounts): 

 
Shares    
 
Grant Date
Weighted-
Average Fair
Value
Per Share
Outstanding at December 31, 2012
1,451

 
$
19.90

Granted
12

 
$
24.89

Vested
(290
)
 
$
20.45

Forfeited/Canceled
—

 
$
—

Outstanding at June 30, 2013
1,173

 
$
19.82

  
Summary of stock option activity  
7.
Share-Based Compensation
Stock Option Activity
A summary of our stock option activity for the six months ended June 30, 2013 is as follows (in thousands):
 
 
Stock
Options
 
Weighted-
Average
Exercise
Price
Outstanding at December 31, 2012
2,181

 
$
17.20

Exercised
(270
)
 
$
16.34

Expired
(36
)
 
$
30.70

Canceled
(23
)
 
$
16.16

Outstanding at June 30, 2013
1,852

 
$
17.08

Exercisable at June 30, 2013
777

 
$
16.84

Vested and expected to vest at June 30, 2013
1,825

 
$
17.10


There were no stock options granted during the six months ended June 30, 2013. The aggregate intrinsic value of our stock options exercised during the three and six months ended June 30, 2013 was $1.3 million and $2.1 million, respectively and the actual tax benefit realized on options exercised during these periods was $513,000 and $833,000, respectively.
At June 30, 2013 there was $4.5 million of total unrecognized compensation cost related to our stock options. This cost is expected to be recognized over a weighted-average period of 2.7 years.
The compensation cost charged against income, for stock options for the three months ended June 30, 2013 and 2012, was $490,000 and $269,000, respectively. The corresponding income tax benefit recognized was $192,000 and $105,000, for the three months ended June 30, 2013 and 2012, respectively.
The compensation cost charged against income, for stock options for the six months ended June 30, 2013 and 2012, was $1.1 million and $744,000, respectively. The corresponding income tax benefit recognized was $428,000 and $291,000, for the six months ended June 30, 2013 and 2012, respectively.