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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of the changes in our restricted stock during the years ended December 31, 2011, 2010 and 2009 is as follows (shares in thousands):
December 31,
2011
2010
2009
 
Shares
Weighted-Average Grant-Date Fair Value per Share
Shares
Weighted-Average Grant-Date Fair Value per Share
Shares
Weighted-Average Grant-Date Fair Value per Share
Outstanding, beginning balance
855

$
38.23

991

$
40.31

830

$
37.83

Granted
—

—

285

28.30

504

40.42

Vested
(368
)
39.25

(350
)
36.16

(277
)
33.22

Forfeited
(15
)
39.62

(71
)
37.62

(66
)
41.29

Outstanding, ending balance
472

$
37.39

855

$
38.23

991

$
40.31