Income Taxes (Schedule Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Current, Federal	$ 24,200	$ 14,391	$ 21,346
Current, State	1,772	656	412
Current provision for income taxes	25,972	15,047	21,758
Deferred, Federal	(4,008)	5,799	(989)
Deferred, State	7	561	(9)
Deferred provision for income taxes	(4,001)	6,360	(998)
Total tax provision	$ 21,971	$ 21,407	$ 20,760