Stock-Based Compensation And Employee Benefit Plans (Summary Of Stock Option Activity) (Details) (Stock Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010 years	Dec. 31, 2009 years	Dec. 31, 2008 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding, beginning of period	12,751	18,033	20,927
Number of Shares, Grants	157	796	1,259
Number of Shares, Exercises	(6,347)	(4,069)	(211)
Number of Shares, Forfeitures or expirations	(630)	(2,009)	(3,942)
Number of Shares, Outstanding, end of period	5,931	12,751	18,033
Number of Shares, Vested and exercisable, end of period	4,292
Number of Shares, Expected to vest, end of period	1,433
Weighted-Average Exercise Price, Outstanding, beginning of period	$ 30.90	$ 30.35	$ 30.35
Weighted-Average Exercise Price, Grants	$ 34.75	$ 32.50	$ 23.39
Weighted-Average Exercise Price, Exercises	$ 31.15	$ 26.09	$ 16.34
Weighted-Average Exercise Price, Forfeitures and expirations	$ 36.12	$ 36.35	$ 28.87
Weighted-Average Exercise Price, Outstanding, end of period	$ 30.18	$ 30.90	$ 30.35
Weighted-Average Exercise Price, Vested and exercisable, end of period	$ 32.15
Weighted-Average Exercise Price, Expected to vest, end of period	$ 24.75
Weighted-Average Remaining Contractual Term, Outstanding, (in years)	4.97	4.66	4.91	5.16
Weighted-Average Remaining Contractual Term, Vested and exercisable, (in years)	3.76
Weighted-Average Remaining Contractual Term, Expected to vest as of December 31, 2011, (in years)	8.12
Aggregate Intrinsic Value, Outstanding, end of period	$ 68,217	$ 52,493	$ 18,123	$ 12
Aggregate Intrinsic Value, Outstanding, Vested and exercisable, end of period	41,564
Aggregate Intrinsic Value, Expected to vest, end of period	$ 23,712