Pensions and Other Postretirement Benefit Plans (Schedule of Net Periodic Benefit Plan Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of net periodic benefit cost:
Curtailment (gain)/loss	$ (700)
United States [Member]
Weighted average assumptions used to determine net cost:
Discount rate	3.70%	4.20%	4.54%
Expected return on plan assets	3.87%	4.40%	4.74%
Rate of compensation increase
Non-U.S. Pension Plans [Member]
Weighted average assumptions used to determine net cost:
Discount rate	2.83%	2.98%	3.67%
Expected return on plan assets	4.83%	4.46%	5.39%
Rate of compensation increase	3.04%	3.29%	3.24%
United States Postretirement Benefits Plan [Member]
Weighted average assumptions used to determine net cost:
Discount rate	3.59%	4.00%	4.24%
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	3.40%	3.70%	4.00%
Expected return on plan assets
Rate of compensation increase	3.00%	3.00%	3.00%
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 2,723	$ 2,720	$ 2,656
Interest cost	7,217	7,476	7,885
Expected return on assets	(8,873)	(8,152)	(8,675)
Amortization of prior service cost/(credit)	34	36	38
Amortization of net actuarial loss	2,219	2,628	2,283
Settlement	2,246		163
Curtailment (gain)/loss	(752)		(112)
Net periodic benefit cost	4,814	4,708	4,238
Other postretirement benefits [Member]
Components of net periodic benefit cost:
Service cost	232	244	254
Interest cost	2,024	2,214	2,443
Expected return on assets
Amortization of prior service cost/(credit)	(4,488)	(4,488)	(4,488)
Amortization of net actuarial loss	2,956	2,811	2,819
Settlement
Curtailment (gain)/loss
Net periodic benefit cost	$ 724	$ 781	$ 1,028