Pension (Schedule Of Net Periodic Pension Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Pension [Abstract]
Service cost	$ 90	$ 80	$ 270	$ 237
Interest cost	138	167	414	500
Expected return on plan assets	(279)	(268)	(837)	(804)
Recognized net actuarial loss	176	137	528	411
Net period cost	$ 125	$ 116	$ 375	$ 344	$ 459