Employee Pension Plans (Summary Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Summary of net periodic benefit cost
Interest cost	$ 646	$ 582
Service cost	240	236
Expected return on plan assets	(973)	(1,015)
Recognized net actuarial losses	639	683
Net periodic benefit cost	$ 552	$ 486