Accounting for Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) (Employee Stock Option [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, shares	8,389,142	7,834,332	8,954,081
Granted, Shares	253,500	1,505,000	1,447,500
Exercised, Shares	(1,050,772)	(623,341)	(2,194,862)
Forfeited and Cancelled, Shares	(487,757)	(326,849)	(372,387)
Ending Balance, shares	7,104,113	8,389,142	7,834,332
Beginning of Period, Weighted Average Exercise Price	$ 32.83	$ 32.08	$ 30.19
Granted, Weighted Average Exercise Price	$ 21.16	$ 35.87	$ 33.89
Exercised, Weighted Average Exercise Price	$ 19.85	$ 30.34	$ 25.88
Forfeited and Cancelled, Weighted Average Exercise Price	$ 34.12	$ 33.69	$ 29.80
End of Period, Weighted Average Exercise Price	$ 34.25	$ 32.83	$ 32.08
Weighted Average Remaining Contractual Term	4 years 7 months 6 days
Aggregate Intrinsic Value	$ 10,504
Exercisable, Shares	5,663,196
Exercisable, Weighted Average Exercise Price	$ 34.64
Exercisable, Weighted Average Remaining Contractual Term	3 years 9 months 18 days
Exercisable, Aggregate Intrinsic Value	$ 6,947