Pension and Other Postretirement Benefits - Other Postretirement Benefits (Details) - Other Postretirement Benefit Plan - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Benefits
Service cost	$ 4	$ 8	$ 8	$ 17
Interest cost	272	375	544	750
Amortization of actuarial loss	174	486	348	972
Net periodic pension (income)/cost or postretirement benefit cost	$ 450	$ 869	$ 900	$ 1,739