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Share-Based Compensation (Tables)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Summary of nonvested stock activity
A summary of our nonvested stock activity for the nine months ended September 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
(362
)
 
$
20.25

Outstanding at September 30, 2013
1,101

 
$
19.84

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

 
$
17.20

Exercised
(912
)
 
$
16.82

Expired
(36
)
 
$
30.70

Canceled
(24
)
 
$
16.21

Outstanding at September 30, 2013
1,209

 
$
17.11

Exercisable at September 30, 2013
472

 
$
16.69

Vested and expected to vest at September 30, 2013
1,191

 
$
17.12