Share-Based Compensation (Summary Of Status Of Non-Vested 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	3 Months Ended
	Mar. 31, 2012
Time-Based Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares at December 31, 2011, Shares	4,104
Granted, Shares	1,861
Vested, Shares	(95)
Forfeited, Shares	(2)
Non-vested shares at March 31, 2012, Shares	5,868
Non-vested shares at December 31, 2011, Weighted-Average Grant-Date Fair Value	$ 18.16
Granted, Weighted-Average Grant-Date Fair Value	$ 13.03
Vested, Weighted-Average Grant-Date Fair Value	$ 18.50
Forfeited, Weighted-Average Grant-Date Fair Value	$ 20.06
Non-vested shares at March 31, 2012, Weighted-Average Grant-Date Fair Value	$ 16.52