Benefit Plans (Schedule Of Net Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Benefit Plans [Abstract]
Service cost	$ 337	$ 377	$ 337
Interest cost	701	695	778
Expected return on plan assets	(1,165)	(1,182)	(1,163)
Amortization of prior service cost	(94)	(126)	(126)
Recognized net actuarial loss	579	623	450
Net pension cost	358	387	276
Effect of settlements loss	564
Total pension expense	$ 922	$ 387	$ 276