Pension and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jul. 31, 2022	Mar. 31, 2024	Mar. 31, 2023
Pensions
Pension and other postretirement benefits expenses
Service cost		$ 300	$ 773
Interest cost		4,628	4,895
Expected return on plan assets		(7,407)	(7,534)
Amortization of prior service cost		27	87
Amortization of actuarial losses		602	417
Curtailment loss	$ 1,370		0
Net periodic benefit income		(480)	(1,362)
Other Postretirement Benefits
Pension and other postretirement benefits expenses
Service cost		10	13
Interest cost		262	285
Amortization of prior service cost		0	3
Amortization of actuarial losses		(40)	(25)
Net periodic benefit income		$ 232	$ 276