Pension Plans and Other Postretirement Benefits Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Total net pension benefits (credit) cost	$ (26)	$ 798	[1]
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,003	1,048
Interest cost	8,288	9,366
Expected return on assets	(9,908)	(10,173)
Actuarial gain	0	(50)
Amortization of prior service benefit	27	28
Total net pension benefits (credit) cost	(590)	219
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	31	29
Interest cost	585	621
Expected return on assets	(28)	(47)
Amortization of prior service benefit	(24)	(24)
Total net pension benefits (credit) cost	$ 564	$ 579

[1] For the three-month period ended March 31, 2016, $0.6 million of net pension and postretirement benefits cost are included in Income from discontinued operations (net of tax) in the consolidated statements of income. See Note 3, “Divestitures,” for additional information.