Benefit Plans (Schedule Of Net Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Benefit Plans [Abstract]
Service cost	$ 377	$ 337	$ 456
Interest cost	695	778	715
Expected return on plan assets	(1,182)	(1,163)	(1,247)
Amortization of prior service cost	(126)	(126)	(125)
Recognized net actuarial loss	623	450	761
Net periodic pension cost	$ 387	$ 276	$ 560