Pensions and Other Postretirement Benefit Plans (Schedule of Net Periodic Benefit Plan Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of net periodic benefit cost:
Settlement			$ 8,190
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	2,656	2,959	3,269
Interest cost	7,885	7,787	9,505
Expected return on assets	(8,675)	(8,630)	(9,577)
Amortization of prior service cost/(credit)	38	48	53
Amortization of transition obligation
Amortization of net actuarial loss	2,283	2,594	2,421
Settlement	162	103	8,331
Curtailment (gain)/loss	(111)		(942)
Special / contractual termination benefits		44
Net periodic benefit cost	$ 4,238	$ 4,905	$ 13,060
Health care cost trend rate (U.S. and non-U.S. plans):
Initial rate
Ultimate rate
Other Postretirement Benefits [Member]
Components of net periodic benefit cost:
Service cost	$ 254	$ 330	$ 314
Interest cost	2,443	2,437	2,741
Expected return on assets
Amortization of prior service cost/(credit)	(4,488)	(4,488)	(4,488)
Amortization of transition obligation
Amortization of net actuarial loss	2,819	3,338	2,908
Settlement
Curtailment (gain)/loss
Special / contractual termination benefits
Net periodic benefit cost	$ 1,028	$ 1,617	$ 1,475
Health care cost trend rate (U.S. and non-U.S. plans):
Initial rate
Ultimate rate
United States Pension Plan [Member]
Weighted average assumptions used to determine net cost:
Discount rate	4.54%	4.18%	5.22%
Expected return on plan assets	4.74%	4.43%	5.40%
Rate of compensation increase
Non-U.S. Pension Plans [Member]
Weighted average assumptions used to determine net cost:
Discount rate	3.67%	3.58%	4.50%
Expected return on plan assets	5.39%	5.52%	5.65%
Rate of compensation increase	3.24%	3.23%	3.39%
United States Postretirement Benefits Plan [Member]
Weighted average assumptions used to determine net cost:
Discount rate	4.24%	3.90%	4.68%
Expected return on plan assets
Rate of compensation increase
Non-U.S. Postretirement Benefits Plan [Member]
Weighted average assumptions used to determine net cost:
Discount rate	4.00%	3.85%	4.75%
Expected return on plan assets
Rate of compensation increase	3.00%	3.00%	3.00%