Pension and Postretirement Benefits (Net Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Postretirement Medical Benefits
Components of the net periodic cost for retirement and postretirement benefits
Interest cost	$ 399	$ 596	$ 754
Amortization of unrecognized net loss	(21)	(132)	(215)
U.S. net pension expense	500	586	661
United States | Pension Plan
Components of the net periodic cost for retirement and postretirement benefits
Service cost	25,162	25,893	23,245
Interest cost	11,952	15,100	17,584
Expected return on plan assets	(25,377)	(25,794)	(25,645)
Settlement loss and other	0	128	0
Amortization of unrecognized prior service cost	188	184	164
Amortization of unrecognized net loss	7,725	6,977	3,675
U.S. net pension expense	19,650	22,488	19,023
Foreign Plan | Pension Plan
Components of the net periodic cost for retirement and postretirement benefits
Service cost	7,336	7,052	5,728
Interest cost	5,544	6,572	8,867
Expected return on plan assets	(6,204)	(5,018)	(7,535)
Settlement loss and other	640	708	859
Amortization of unrecognized net loss	4,509	4,315	2,933
U.S. net pension expense	$ 12,125	$ 13,891	$ 11,117