Stock Transactions (RSU And Restricted Stock Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Transactions [Abstract]
Unvested at beginning of year, Number of RSUs / Restricted Shares	5,153	5,580	4,128
Unvested at beginning of year, Weighted-Average Grant-Date Fair Value	$ 33.77	$ 29.53	$ 30.29
Forfeited, Number of RSUs / Restricted Shares	(397)	(309)	(166)
Forfeited, Weighted-Average Grant-Date Fair Value	$ 38.59	$ 34.37	$ 34.21
Vested, Number of RSUs / Restricted Shares	(405)	(1,877)	(296)
Vested, Weighted-Average Grant-Date Fair Value	$ 35.81	$ 25.19	$ 31.42
Granted, Number of RSUs / Restricted Shares	1,628	1,759	1,914
Granted, Weighted-Average Grant-Date Fair Value	$ 49.96	$ 38.17	$ 28.60
Unvested at end of year, Number of RSUs / Restricted Shares	5,979	5,153	5,580
Unvested at end of year, Weighted-Average Grant-Date Fair Value	$ 37.72	$ 33.77	$ 29.53