Pensions and Other Postretirement Benefit Plans (Schedule of Net Periodic Benefit Plan Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Curtailment (gain)/loss			$ (500)
Pension plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 2,192	$ 2,279	2,543
Interest cost	5,467	6,172	7,216
Expected return on assets	(6,564)	(6,853)	(8,285)
Amortization of prior service cost/(credit)	13	14	68
Amortization of net actuarial loss	2,365	2,412	2,253
Settlement	0	148	(16)
Curtailment (gain)/loss	0	263	466
Net periodic benefit cost	$ 3,473	$ 4,435	$ 4,245
Pension plans | United States
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	2.65%	3.40%	4.41%
Expected return on plan assets	2.74%	3.54%	4.57%
Rate of compensation increase	0.00%	0.00%	0.00%
Pension plans | Foreign Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	1.91%	2.31%	2.98%
Expected return on plan assets	2.89%	3.45%	4.45%
Rate of compensation increase	2.71%	2.81%	3.02%
Pension plans | Switzerland
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Cash balance interest crediting rate	0.05%	0.25%	0.85%
Other postretirement benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 132	$ 200	$ 189
Interest cost	1,103	1,712	2,114
Expected return on assets	0	0	0
Amortization of prior service cost/(credit)	(4,488)	(4,488)	(4,488)
Amortization of net actuarial loss	2,260	2,592	2,227
Settlement	0	0	0
Curtailment (gain)/loss	0	0	0
Net periodic benefit cost	$ (993)	$ 16	$ 42
Other postretirement benefits | United States
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	2.38%	3.27%	4.31%
Expected return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%	3.00%
Other postretirement benefits | Foreign Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	2.75%	3.05%	3.65%
Expected return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	2.75%	3.00%	3.00%
Other postretirement benefits | Switzerland
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Cash balance interest crediting rate	0.00%	0.00%	0.00%