Stock-Based Compensation (Summary Of Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y
Stock-Based Compensation [Abstract]
Options, Outstanding Beginning Balance	15,556,786
Options, Granted	2,513
Options, Exercised	(630,675)
Options, Forfeited	0
Options, Expired	(83,525)
Options, Outstanding Ending Balance	14,845,099
Weighted Average Exercise Price, Outstanding Beginning Balance	$ 38.13
Weighted Average Exercise Price, Granted	$ 35.94
Weighted Average Exercise Price, Exercised	$ 32.85
Weighted Average Exercise Price, Forfeited	$ 0.00
Weighted Average Exercise Price, Expired	$ 40.03
Weighted Average Exercise Price, Outstanding Ending Balance	$ 38.34
Weighted Average Remaining Life (years), Outstanding Ending Balance	1.34
Aggregate Intrinsic Value, Outstanding Ending Balance	$ 759