Employee Pension Plans (Summary Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Summary of net periodic benefit cost
Interest cost	$ 969	$ 647	$ 1,938	$ 1,293
Service cost	255	240	510	480
Expected return on plan assets	(979)	(973)	(1,957)	(1,946)
Recognized net actuarial losses	413	638	826	1,277
Net periodic benefit cost	$ 658	$ 552	$ 1,317	$ 1,104