Employee Pension Plans (Summary Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Summary of net periodic benefit cost
Interest cost	$ 968	$ 647	$ 2,906	$ 1,940
Service cost	255	240	765	720
Expected return on plan assets	(978)	(973)	(2,935)	(2,919)
Recognized net actuarial losses	413	639	1,239	1,916
Net periodic benefit cost	$ 658	$ 553	$ 1,975	$ 1,657