Employee Pension Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Summary of net periodic benefit cost
Interest cost	$ 910	$ 969	$ 1,821	$ 1,938
Service cost	232	255	463	510
Expected return on plan assets	(944)	(979)	(1,888)	(1,957)
Recognized net actuarial losses	438	413	875	826
Net periodic benefit cost	$ 636	$ 658	$ 1,271	$ 1,317