Share-Based Compensation (Time-Based Restricted Stock And Restricted Stock Units) (Details) (Time-Based Restricted Stock And Restricted Stock Units [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Time-Based Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested shares at December 31, 2010, Shares	3,698
Granted, Shares	1,600
Vested, Shares	(917)
Forfeited, Shares	(277)
Nonvested shares and share units at December 31, 2011, Shares	4,104
Nonvested shares at December 31, 2010, Weighted-average grant-date fair value	$ 18.33
Granted, Weighted-average grant-date fair value	$ 18.97
Vested, Weighted-average grant-date fair value	$ 18.80
Forfeited, Weighted-average grant-date fair value	$ 22.96
Nonvested shares and share units at December 31, 2011, Weighted-average grant-date fair value	$ 18.16