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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
Share-Based Compensation [Abstract]  
Summary of stock option activity
A summary of our stock options as of June 30, 2014 and changes during the six months then ended is presented below:
 
 
 
Shares
(000s)
  
Weighted-Average
Exercise Price
 
Weighted-Average Remaining Contractual Term (years)
 
Aggregate Value ($000s)
 
Stock Options
 
  
 
 
 
Outstanding at January 1, 2014
  
4,325
  
$
15.09
 
 
 
Granted
  
98
   
16.60
 
 
 
Exercised
  
(106
)
  
12.39
 
 
 
Forfeited
  
(59
)
  
13.00
 
 
 
Expired
  
(28
)
  
33.49
 
 
 
Outstanding at June 30, 2014
  
4,230
   
15.09
   
6.04
  
$
20,135
 
Exercisable at June 30, 2014
  
2,441
  
$
17.72
   
4.62
  
$
9,335
 
 
Summary of restricted stock and restricted stock units ("nonvested shares")
The following table shows a summary of our restricted stock, restricted stock units and performance share units ("nonvested shares") as of June 30, 2014, as well as activity during the six months then ended:
 
 Restricted Stock and Restricted Stock UnitsPerformance Share Units
Nonvested Shares
 
Shares
(000s)
  
Weighted- Average
Grant Date
Fair Value
  
Shares
(000s)
  
Weighted- Average
Grant Date
Fair Value
 
Nonvested at January 1, 2014
  
841
  
$
10.44
   
—
  
$
—
 
Granted
  
264
   
16.71
   
303
   
14.74
 
Vested
  
(160
)
  
10.92
   
—
   
—
 
Forfeited
  
(21
)
  
11.16
   
—
   
—
 
Nonvested at June 30, 2014
  
924
  
$
12.14
   
303
  
$
14.74