Pension and Other Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pensions
Pension and other postretirement benefits expenses
Service cost	$ 1,462	$ 1,633	$ 4,345	$ 4,912
Interest cost	3,643	3,186	10,511	9,562
Expected return on plan assets	(7,264)	(6,963)	(21,801)	(20,897)
Amortization of prior service cost	97	83	304	248
Amortization of actuarial losses	3,098	3,999	9,755	12,005
Curtailment loss	(1,158)	0	(1,158)	0
Special termination benefits	259	0	395	0
Net periodic benefit cost	2,453	1,938	4,667	5,830
Other Postretirement Benefits
Pension and other postretirement benefits expenses
Service cost	19	27	58	77
Interest cost	197	203	606	615
Amortization of prior service cost	9	7	27	22
Amortization of actuarial losses	(1)	54	(2)	194
Net periodic benefit cost	$ 224	$ 291	$ 689	$ 908