Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 1,277	$ 1,252	$ 1,008
Interest cost	2,078	1,899	1,800
Expected return on plan assets	(2,971)	(3,165)	(2,959)
Recognized loss	1,552	1,423	385
Total	$ 1,936	$ 1,409	$ 234