Income Taxes (Schedule Of Accrued Liability For Unrecognized Tax Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 1,228	$ 1,278
Gross increases – tax positions in prior period	5	0
Gross decreases – tax positions in prior period	0	(1)
Gross increases – current-period tax positions	268	269
Lapse of statute of limitations	(293)	(318)
Unrecognized tax benefits at end of year	$ 1,208	$ 1,228