Pension (Schedule Of Net Periodic Pension Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Pension [Abstract]
Service cost	$ 80	$ 83	$ 237	$ 247
Interest cost	167	180	500	540
Expected return on plan assets	(268)	(290)	(804)	(873)
Settlement expense		225		225
Recognized net actuarial loss	137	120	411	351
Net period cost	$ 116	$ 318	$ 344	$ 490	$ 922