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Share-Based Compensation and Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of outstanding stock options
The following table summarizes activity for our outstanding stock options for the years ended December 31, 2012, 2011 and 2010 (numbers of options in thousands):
 
2012
 
2011
 
2010
 
Number of Options
 
Weighted
Average
Exercise
Price
 
Number of Options
 
Weighted
Average
Exercise
Price
 
Number of Options
 
Weighted
Average
Exercise
Price
Outstanding at beginning of year
6,809

 
$
26.47

 
7,733

 
$
26.53

 
9,576

 
$
26.14

Granted
—

 
—

 
—

 
—

 
3

 
21.67

Exercised
(2,253
)
 
21.75

 
(203
)
 
8.99

 
(202
)
 
8.92

Forfeited
(1,511
)
 
29.66

 
(721
)
 
32.09

 
(1,644
)
 
26.43

Outstanding at end of year
3,045

 
$
28.39

 
6,809

 
$
26.47

 
7,733

 
$
26.53

Exercisable at end of year
2,841

 
$
29.79

 
6,146

 
$
27.50

 
5,996

 
$
29.54
Summary of restricted stock awards
The following table summarizes activity for restricted stock awards for the years ended December 31, 2012, 2011 and 2010 (numbers of shares in thousands):
 
2012
 
2011
 
2010
 
Number of Shares
 
Weighted
Average
Grant-Date
Fair Value
 
Number of Shares
 
Weighted
Average
Grant-Date
Fair Value
 
Number of Shares
 
Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year
463

 
$
21.53

 
544

 
$
19.36

 
458

 
$
26.73

Granted
241

 
24.31

 
290

 
25.59

 
381

 
16.72

Vested
(178
)
 
21.86

 
(243
)
 
24.31

 
(261
)
 
27.56

Forfeited
—

 
—

 
(128
)
 
16.16

 
(34
)
 
26.11

Unvested at end of year
526

 
$
22.69

 
463

 
$
21.53

 
544

 
$
19.36