Pensions and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 9,400
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	230,790	$ 245,800	$ 227,211
Defined benefit plan, benefit obligation, period increase (decrease)	(15,000)	18,600
Actuarial (gain)/loss	7,163	(13,309)
Employer contributions	2,431	3,219
Other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	44,884	47,977	$ 54,384
Defined benefit plan, benefit obligation, period increase (decrease)	(3,100)	(6,400)
Actuarial (gain)/loss	995	4,794
Employer contributions	$ 3,338	$ 3,555
United States
Defined Benefit Plan Disclosure [Line Items]
Percent of consolidated pension plan assets	44.00%
Percent of consolidated pension plan obligations	48.00%
Accrued postretirement liability	$ 43,700
Switzerland | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	5,400
Canada
Defined Benefit Plan Disclosure [Line Items]
Accrued postretirement liability	$ 1,200