Pensions and Other Postretirement Benefit Plans (Schedule of Plan Benefit Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plans [Member]
Change in benefit obligation:
Benefit obligation, beginning of year	$ 199,856	$ 213,110
Service cost	2,656	2,959	$ 3,269
Interest cost	7,885	7,787	9,505
Plan participants' contributions	249	304
Actuarial (gain)/loss	17,676	(4,209)
Benefits paid	(7,057)	(6,530)
Settlements and curtailments	(2,436)	(321)
Plan amendments and other	36	(37)
Foreign currency changes	(8,009)	(13,207)
Benefit obligation, end of year	210,856	199,856	213,110
Other Postretirement Benefits [Member]
Change in benefit obligation:
Benefit obligation, beginning of year	59,970	64,987
Service cost	254	330	314
Interest cost	2,443	2,437	2,741
Actuarial (gain)/loss	(395)	(2,855)
Benefits paid	(4,812)	(4,758)
Settlements and curtailments
Plan amendments and other
Foreign currency changes	28	(171)
Benefit obligation, end of year	57,488	59,970	$ 64,987
Accumulated benefit obligation
United States Pension Plan [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	4.20%	4.54%
Compensation increase
Non-U.S. Pension Plans [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	2.98%	3.67%
Compensation increase	3.29%	3.24%
United States Postretirement Benefits Plan [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	4.00%	4.24%
Compensation increase
Non-U.S. Postretirement Benefits Plan [Member]
Weighted average assumptions used to determine benefit obligations, end of year:
Discount rate	3.70%	4.00%
Compensation increase	3.00%	3.00%