Pension (Schedule Of Net Periodic Pension Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Pension [Abstract]
Service cost	$ 90	$ 79	$ 180	$ 157
Interest cost	138	167	276	333
Expected return on plan assets	(279)	(268)	(558)	(536)
Recognized net actuarial loss	176	137	352	274
Net period cost	$ 125	$ 115	$ 250	$ 228	$ 459