Stock-Based Compensation Plans (Schedule Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Stock-Based Compensation Plans [Abstract]
Outstanding, Beginning Balance, Shares	863
Outstanding, Beginning Balance, Outstanding Weighted-Average Exercise Price	$ 32.69
Granted, Shares	188
Granted, Outstanding Weighted-Average Exercise Price	$ 76.20
Exercised, Shares	(252)
Exercised, Outstanding Weighted-Average Exercise Price	$ 29.86
Forfeited, Shares	(51)
Forfeited, Weighted-Average Grant-Date Fair Value	$ 47.12
Expired or canceled, Shares	(2)
Expired or canceled, Outstanding Weighted-Average Exercise Price	$ 41.95
Outstanding, Ending Balance, Shares	746
Outstanding, Ending Balance, Outstanding Weighted-Average Exercise Price	$ 43.47
Outstanding, Ending Balance, Aggregate Intrinsic Value	$ 25,170
Outstanding, Ending Balance, Weighted-Average Remaining Contractual Life (in years)	4.2
Exercisable, Ending Balance, Shares	389
Exercisable, Ending Balance, Outstanding Weighted-Average Exercise Price	$ 33.83
Exercisable, Ending Balance, Aggregate Intrinsic Value	$ 16,831
Exercisable, Ending Balance, Weighted-Average Remaining Contractual Life (in years)	3.1