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Share-Based Compensation
 3 Months Ended
Mar. 31, 2014
Share-Based Compensation [Abstract]  
Share-Based Compensation
(3)Share-Based Compensation

We have several stockholder-approved stock incentive plans for our employees and directors.  We currently have three types of share-based awards outstanding under these plans: stock options, restricted stock units, and restricted stock.  We believe that such awards align the interests of our employees and directors with those of our stockholders.

For the three months ended March 31, 2014 and 2013, we recognized share-based compensation costs of $1.7 million and $1.5 million, respectively.
 
A summary of our stock options as of March 31, 2014 and changes during the three months then ended is presented below:
 
 
  
Shares
(000s)
 
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term
(years)
 
Aggregate Intrinsic Value
($000s)
 
Options
     
 
 
 
Outstanding at January 1, 2014
  
4,325
  
$
15.09
 
 
 
Granted
  
15
   
16.01
 
 
 
Exercised
  
(29
)
  
10.81
 
 
 
Forfeited
  
(33
)
  
11.57
 
 
 
Expired
  
(19
)
  
31.74
 
 
 
Outstanding at March 31, 2014
  
4,259
   
15.07
   
6.22
  
$
19,083
 
Exercisable at March 31, 2014
  
2,447
  
$
17.84
   
4.79
  
$
8,524
 

The weighted-average grant-date fair value of options granted during the three months ended March 31, 2014 was $8.80.
 
The following table shows a summary of our restricted stock and restricted stock units ("nonvested shares") as of March 31, 2014, as well as activity during the three months then ended:

 
Nonvested Shares
 
Shares
(000s)
  
Weighted-Average Grant Date Fair Value
 
Nonvested at January 1, 2014
  
841
  
$
10.44
 
Granted
  
—
   
—
 
Vested
  
(122
)
  
10.59
 
Forfeited
  
(14
)
  
10.64
 
Nonvested at March 31, 2014
  
705
  
$
10.42