Employee Pension Plans (Summary Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Summary of net periodic benefit cost
Interest cost	$ 647	$ 582	$ 1,293	$ 1,164
Service cost	240	237	480	473
Expected return on plan assets	(973)	(1,015)	(1,946)	(2,030)
Recognized net actuarial losses	638	683	1,277	1,366
Net periodic benefit cost	$ 552	$ 487	$ 1,104	$ 973