Share-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Share-Based Compensation [Abstract]
Shares, Beginning Balance	3,132
Shares, Granted	228
Shares, Exercised	(668)
Shares, Forfeited	(406)
Shares, Ending Balance	2,286
Shares, Exercisable	1,398
Shares, Vested and expected to vest	2,264
Weighted Average Exercise Price, Beginning Balance	$ 26.23
Weighted Average Exercise Price, Granted	$ 36.27
Weighted Average Exercise Price, Exercised	$ 15.49
Weighted Average Exercise Price, Forfeited	$ 27.83
Weighted Average Exercise Price, Ending Balance	$ 30.11
Weighted Average Exercise Price, Exercisable	$ 34.75
Weighted Average Exercise Price, Vested and expected to vest	$ 30.15
Weighted Average Remaining Life, Ending Balance, in years	5.5
Weighted Average Remaining Life, Exercisable, in years	4.1
Weighted Average Remaining Life, Vested and expected to vest, in years	5.5
Aggregate Intrinsic Value, Ending Balance	$ 11,649
Aggregate Intrinsic Value, Exercisable	8,635
Aggregate Intrinsic Value, Vested and expected to vest	$ 18,095