Pension and Other Postretirement Benefits (Details 10) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pensions [Member]
Pension and other postretirement benefits expenses
Service cost	$ 2,589	$ 5,689	$ 6,547
Interest cost	19,415	14,108	12,749
Expected return on plan assets	(30,056)	(28,944)	(27,858)
Amortization of prior service cost	354	387	332
Recognized losses/(gains)	1,643	12,710	16,006
Curtailment (gain)/loss	(668)	1,158	(133)
Settlement (gain)/loss	(656)	(605)	205
Special termination benefits	0	395	0
Net periodic benefit cost	(7,379)	4,898	7,848
Other Postretirement Benefits [Member]
Pension and other postretirement benefits expenses
Service cost	39	77	103
Interest cost	1,122	808	819
Expected return on plan assets	0	0	0
Amortization of prior service cost	10	36	29
Recognized losses/(gains)	(146)	(2)	258
Curtailment (gain)/loss	0	0	0
Settlement (gain)/loss	0	0	0
Special termination benefits	0	0	0
Net periodic benefit cost	$ 1,025	$ 919	$ 1,209