Income Taxes (Schedule Of Effective Tax Rates That Varied From The Statutory Federal Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal income tax provision at statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	2.60%	3.60%	4.70%
Benefit from lower foreign tax rates	(4.60%)	(1.90%)	(2.20%)
Expenses not deductible for tax purposes	1.80%	2.70%	0.80%
Changes in contingent consideration	(1.50%)
All other	(1.20%)	(0.80%)	(1.40%)
Effective income tax rate	32.10%	38.60%	36.90%