Pension and Post-Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,336	$ 0
Interest cost	6,198	567
Expected return on plan assets	(9,976)	(802)
Amortization of net loss	297	303
Net periodic benefit cost (income)	(2,145)	68
Non-US Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	554	323
Interest cost	561	568
Expected return on plan assets	(114)	0
Amortization of net loss	151	0
Net periodic benefit cost (income)	1,152	891
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	163
Interest cost	500
Amortization of net loss	15
Net periodic benefit cost (income)	678
Non-U.S. Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	5
Interest cost	14	145
Amortization of net loss	0	31
Net periodic benefit cost (income)	$ 19	$ 181