Pensions and Other Postretirement Benefit Plans (Schedule of Plan Benefit Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
United States [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	3.40%	4.41%
Non-U.S. Pension Plans [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	2.31%	2.98%
Compensation increase	2.81%	3.02%
United States Postretirement Benefits Plan [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	3.27%	4.31%
Compensation increase	3.00%	3.00%
Non-U.S. Postretirement Benefits Plan [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	3.05%	3.65%
Compensation increase	3.00%	3.00%
Pension Plans [Member]
Change in benefit obligation:
Benefit obligation, beginning of year	$ 201,450	$ 230,911
Service cost	2,543	2,723	$ 2,720
Interest cost	7,216	7,217	7,476
Plan participants' contributions	243	228
Actuarial (gain)/loss	22,645	(10,666)
Benefits paid	(8,404)	(7,814)
Settlements and curtailments	(1,768)	(13,807)
Plan amendments and other	152	534
Foreign currency changes	3,134	(7,876)
Benefit obligation, end of year	227,211	201,450	230,911
Accumulated benefit obligation	218,006	193,870
Other postretirement benefits [Member]
Change in benefit obligation:
Benefit obligation, beginning of year	51,127	58,531
Service cost	189	232	244
Interest cost	2,114	2,024	2,214
Plan participants' contributions		14
Actuarial (gain)/loss	4,686	(6,100)
Benefits paid	(3,782)	(3,473)
Settlements and curtailments
Plan amendments and other
Foreign currency changes	49	(87)
Benefit obligation, end of year	54,384	51,127	$ 58,531
Accumulated benefit obligation

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change, classified as other.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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