Pension (Schedule Of Net Periodic Pension Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Pension [Abstract]
Service cost	$ 78	$ 81
Interest cost	166	180
Expected return on plan assets	(268)	(293)
Recognized net actuarial loss	137	111
Net pension cost	$ 113	$ 79	$ 922