Pension and Post-Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pension Plan [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 8,108	$ 0
Service cost	$ 1,336	$ 315	4,007	315
Defined Benefit Plan, Plan Assets, Administration Expense	0	730	0	730
Interest cost	6,198	2,191	18,594	1,553
Expected return on plan assets	(9,976)	(3,800)	(29,928)	(5,260)
Amortization of net loss	297	338	892	978
Net periodic benefit cost (income)	(2,145)	(226)	(6,435)	(1,684)
Pension Plan [Member] | Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			659	0
Service cost	528	318	1,509	777
Defined Benefit Plan, Plan Assets, Administration Expense	0	0	0	0
Interest cost	615	622	1,754	1,763
Expected return on plan assets	(162)	(50)	(466)	(50)
Amortization of net loss	217	0	663	0
Net periodic benefit cost (income)	1,198	890	3,460	2,490
Other Postretirement Benefits Plan [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	163	72	489	81
Interest cost	500	250	1,499	540
Amortization of net loss	15	31	45	94
Net periodic benefit cost (income)	678	353	2,033	715
Other Postretirement Benefits Plan [Member] | Non-U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	1	41	1
Interest cost	35	3	100	3
Amortization of net loss	0	0	0	0
Net periodic benefit cost (income)	$ 49	$ 4	$ 141	$ 4