Pension (Schedule Of Net Periodic Pension Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Pension [Abstract]
Service cost	$ 79	$ 83	$ 157	$ 164
Interest cost	167	180	333	360
Expected return on plan assets	(268)	(290)	(536)	(583)
Recognized net actuarial loss	137	120	274	231
Net pension cost	$ 115	$ 93	$ 228	$ 172	$ 922