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Share-Based Compensation - (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014, 2013 and 2012 (numbers of options in thousands):
 
2014
 
2013
 
2012
 
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
2,991

 
$
28.48

 
3,045

 
$
28.39

 
6,809

 
$
26.47

Exercised
(1,347
)
 
27.97

 
(44
)
 
22.52

 
(2,253
)
 
21.75

Forfeited
(4
)
 
25.45

 
(10
)
 
27.82

 
(1,511
)
 
29.66

Outstanding at end of year
1,640

 
$
28.91

 
2,991

 
$
28.48

 
3,045

 
$
28.39

Exercisable at end of year
1,640

 
$
28.91

 
2,991

 
$
28.48

 
2,841

 
$
29.79
Summary of restricted stock awards
The following table summarizes activity for restricted stock awards for the years ended December 31, 2014, 2013 and 2012 (numbers of shares in thousands):
 
2014
 
2013
 
2012
 
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
575

 
$
25.28

 
526

 
$
22.69

 
463

 
$
21.53

Granted
196

 
26.69

 
253

 
27.86

 
241

 
24.31

Vested
(238
)
 
24.07

 
(204
)
 
21.81

 
(178
)
 
21.86

Forfeited
(20
)
 
26.26

 
—

 
—

 
—

 
—

Unvested at end of year
513

 
$
26.34

 
575

 
$
25.28

 
526

 
$
22.69