Stock-Based Compensation (Schedule Of Weighted Average Value And Assumptions For Fair Value Of Options) (USD $)	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010 years	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value	$ 19.22	$ 8.31	$ 5.67
Risk-free interest rate	2.80%	2.90%	2.80%
Expected life in years	6	6
Expected volatility	41.90%	41.80%	42.50%
Expected dividend yield	0.50%	1.10%	1.50%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life in years			6
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life in years			7