Pensions and Other Benefit Programs (Components of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Pension Plans | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 37	$ 30
Interest cost	15,616	17,244
Expected return on plan assets	(25,424)	(24,548)
Amortization of transition credit	0	0
Amortization of prior service (credit) cost	(15)	(15)
Amortization of net actuarial loss	8,076	7,268
Net periodic benefit cost (income)	(1,710)	(21)
Defined Benefit Pension Plans | Foreign
Defined Benefit Plan Disclosure [Line Items]
Service cost	589	542
Interest cost	4,696	4,544
Expected return on plan assets	(9,185)	(7,780)
Amortization of transition credit	(2)	(2)
Amortization of prior service (credit) cost	(18)	(18)
Amortization of net actuarial loss	1,912	2,034
Net periodic benefit cost (income)	(2,008)	(680)
Nonpension Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	407	419
Interest cost	1,603	1,771
Expected return on plan assets	0	0
Amortization of transition credit	0	0
Amortization of prior service (credit) cost	88	74
Amortization of net actuarial loss	934	884
Net periodic benefit cost (income)	$ 3,032	$ 3,148