Income Taxes (Schedule Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Current, U.S. federal	$ 36,779	$ 23,934	$ 11,724
Current, U.S. state and local	7,078	4,484	4,144
Current, Foreign	600	452	465
Deferred, U.S. federal, state and local	(2,773)	5,185	2,402
Deferred, Foreign	2	1	5
Income tax provision	$ 41,686	$ 34,056	$ 18,740