Income Taxes (Schedule Of Difference Between Actual Income Tax Provision For Continuing Operations And Income Tax Provision Calculated At Statutory U.S. Federal Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Abstract]
Statutory rate	21.00%
Income tax provision calculated using the statutory rate of 21%	$ 73,566	$ 83,158	$ 54,938
Excess stock compensation tax benefits	(9,884)	(26,089)	(24,177)
State and local income taxes, less federal income tax effect	10,025	13,855	7,880
Nondeductible expenses	7,443	5,377	3,048
Other --net	614	223	(3)
Income tax provision	$ 81,764	$ 76,524	$ 41,686
Effective tax rate	23.30%	19.30%	15.90%