Pension and Other Postretirement Benefits (Details 10) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pensions [Member]
Pension and other postretirement benefits expenses
Service cost	$ 6,547	$ 6,269	$ 5,425
Interest cost	12,749	15,084	18,239
Expected return on plan assets	(27,858)	(29,698)	(29,425)
Amortization of prior service cost	332	359	404
Recognized losses	16,006	13,626	8,889
Curtailment (gain)/loss	(133)	484	0
Settlement loss	205	549	340
Net periodic benefit cost	7,848	6,673	3,872
Other Postretirement Benefits [Member]
Pension and other postretirement benefits expenses
Service cost	103	81	70
Interest cost	819	1,041	1,345
Expected return on plan assets	0	0	0
Amortization of prior service cost	29	27	25
Recognized losses	258	35	13
Curtailment (gain)/loss	0	0	0
Settlement loss	0	0	0
Net periodic benefit cost	$ 1,209	$ 1,184	$ 1,453