Pensions and Other Benefit Programs (Components of Net Periodic Benefit Cost (Income)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Pension Plans | United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 34	$ 22	$ 64	$ 54
Interest cost	17,121	18,072	34,366	36,902
Expected return on plan assets	(24,369)	(25,370)	(48,917)	(50,959)
Amortization of transition credit	0	0	0	0
Amortization of prior service (credit) cost	(15)	(15)	(30)	(30)
Amortization of net actuarial loss	7,229	6,851	14,497	13,557
Settlement	0	690	0	1,788
Net periodic benefit cost (income)	0	250	(20)	1,312
Defined Benefit Pension Plans | Foreign
Defined Benefit Plan Disclosure [Line Items]
Service cost	559	546	1,101	1,073
Interest cost	4,640	5,746	9,184	11,407
Expected return on plan assets	(7,961)	(8,581)	(15,742)	(17,053)
Amortization of transition credit	(2)	(2)	(4)	(4)
Amortization of prior service (credit) cost	(17)	(18)	(35)	(35)
Amortization of net actuarial loss	1,892	1,373	3,926	2,716
Settlement	0	0	0	0
Net periodic benefit cost (income)	(889)	(936)	(1,570)	(1,896)
Nonpension Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	434	521	853	1,022
Interest cost	1,770	1,847	3,541	3,983
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	148	148
Amortization of net actuarial loss	905	447	1,789	1,807
Settlement	0	0	0	0
Net periodic benefit cost (income)	$ 3,183	$ 2,889	$ 6,331	$ 6,960