Income Taxes (Schedule Of Company's Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of period	$ 3,006	$ 2,888
Changes for tax positions of current year	86	118
Changes for tax positions of prior years	0	561
Lapse of statute of limitations	(13)	(561)
Balance, end of period	$ 3,079	$ 3,006