Stockholders' Equity And Share-Based Awards (Summary Of Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years
Stockholders' Equity And Share-Based Awards [Abstract]
Options outstanding, beginning of year, Shares	2,529,300
Granted, Shares
Exercised, Shares	(990,200)
Cancelled, Shares	(46,300)
Options outstanding, end of year, Shares	1,492,800	[1]
Options outstanding, beginning of year, Weighted Average Exercise Price	$ 20.33
Granted, Weighted Average Exercise Price
Exercised, Weighted Average Exercise Price	$ 15.09
Cancelled, Weighted Average Exercise Price	$ 21.69
Options outstanding, end of year, Weighted Average Exercise Price	$ 23.59	[1]
Options outstanding, end of year, Weighted average remaining life (years)	2.6	[1]
Options outstanding, end of year, Total Intrinsic Value	$ 10,600,000	[1]
Options exercisable, end of year, Shares	1,318,800
Options exercisable, end of year, Weighted Average Exercise Price	23.76
Options exercisable, end of year, Weighted average remaining life (years)	2.3
Options exercisable, end of year, Total Intrinsic Value	$ 9,200,000

[1] Approximates the options vested and expected to vest