Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Retirement Benefits [Abstract]
Service cost	$ 457	$ 305	$ 786	$ 578
Interest cost	533	397	1,024	677
Expected return on plan assets	(1,488)	(840)	(2,527)	(1,432)
Amortization of net loss	282	273	543	570
Total	$ (216)	$ 135	$ (174)	$ 393