Pensions and Other Benefit Programs (Components of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Pension Plans | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 34	$ 26	$ 98	$ 80
Interest cost	17,122	18,452	51,488	55,354
Expected return on plan assets	(24,369)	(25,480)	(73,287)	(76,439)
Amortization of transition credit	0	0	0	0
Amortization of prior service (credit) cost	(15)	(15)	(45)	(45)
Amortization of net actuarial loss	7,229	6,779	21,725	20,336
Settlement	0	183	0	1,971
Net periodic benefit cost (income)	1	(55)	(21)	1,257
Defined Benefit Pension Plans | Foreign
Defined Benefit Plan Disclosure [Line Items]
Service cost	587	549	1,688	1,622
Interest cost	4,809	5,366	13,993	16,773
Expected return on plan assets	(8,214)	(7,976)	(23,956)	(25,029)
Amortization of transition credit	(2)	(2)	(6)	(6)
Amortization of prior service (credit) cost	(18)	(19)	(53)	(54)
Amortization of net actuarial loss	2,055	1,302	5,981	4,018
Settlement	0	0	0	0
Net periodic benefit cost (income)	(783)	(780)	(2,353)	(2,676)
Nonpension Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	438	512	1,290	1,534
Interest cost	1,780	1,994	5,321	5,977
Expected return on plan assets	0	0	0	0
Amortization of transition credit	0	0	0	0
Amortization of prior service (credit) cost	74	74	223	222
Amortization of net actuarial loss	905	904	2,693	2,711
Settlement	0	0	0	0
Net periodic benefit cost (income)	$ 3,197	$ 3,484	$ 9,527	$ 10,444