Pensions and Other Postretirement Benefit Plans (Schedule of Plan Benefit Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
United States [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	4.41%	3.70%
Compensation increase
Non-U.S. Pension Plans [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	2.93%	2.83%
Compensation increase	3.02%	3.02%
United States Postretirement Benefits Plan [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	4.31%	3.59%
Compensation increase	3.00%
Non-U.S. Postretirement Benefits Plan [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	3.65%	3.40%
Compensation increase	3.00%	3.00%
Pension Plans [Member]
Change in benefit obligation:
Benefit obligation, beginning of year	$ 230,911	$ 210,856
Service cost	2,723	2,720	$ 2,656
Interest cost	7,217	7,476	7,885
Plan participants' contributions	228	211
Actuarial (gain)/loss	(10,666)	6,626
Benefits paid	(7,814)	(7,697)
Settlements and curtailments	(13,807)	(8)
Plan amendments and other	534	(3)
Foreign currency changes	(7,876)	10,730
Benefit obligation, end of year	201,450	230,911	210,856
Accumulated benefit obligation	193,870	220,622
Other postretirement benefits [Member]
Change in benefit obligation:
Benefit obligation, beginning of year	58,531	57,488
Service cost	232	244	254
Interest cost	2,024	2,214	2,443
Plan participants' contributions	14	37
Actuarial (gain)/loss	(6,100)	2,743
Benefits paid	(3,473)	(4,230)
Settlements and curtailments
Plan amendments and other
Foreign currency changes	(87)	72
Benefit obligation, end of year	51,127	58,531	$ 57,488
Accumulated benefit obligation