Employee Pension Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Summary of net periodic benefit cost
Interest cost	$ 911	$ 969
Service cost	231	255
Expected return on plan assets	(944)	(978)
Recognized net actuarial losses	437	413
Net periodic benefit cost	$ 635	$ 659