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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013, 2012 and 2011 (numbers of options in thousands):
 
2013
 
2012
 
2011
 
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
3,045

 
$
28.39

 
6,809

 
$
26.47

 
7,733

 
$
26.53

Exercised
(44
)
 
22.52

 
(2,253
)
 
21.75

 
(203
)
 
8.99

Forfeited
(10
)
 
27.82

 
(1,511
)
 
29.66

 
(721
)
 
32.09

Outstanding at end of year
2,991

 
$
28.48

 
3,045

 
$
28.39

 
6,809

 
$
26.47

Exercisable at end of year
2,991

 
$
28.48

 
2,841

 
$
29.79

 
6,146

 
$
27.50
Summary of restricted stock awards
The following table summarizes activity for restricted stock awards for the years ended December 31, 2013, 2012 and 2011 (numbers of shares in thousands):
 
2013
 
2012
 
2011
 
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
526

 
$
22.69

 
463

 
$
21.53

 
544

 
$
19.36

Granted
253

 
27.86

 
241

 
24.31

 
290

 
25.59

Vested
(204
)
 
21.81

 
(178
)
 
21.86

 
(243
)
 
24.31

Forfeited
—

 
—

 
—

 
—

 
(128
)
 
16.16

Unvested at end of year
575

 
$
25.28

 
526

 
$
22.69

 
463

 
$
21.53