Pension Plans and Other Postretirement Benefits - Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total net pension and postretirement benefits (credit) cost	$ (1,719)	$ 577
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,214	1,130
Interest cost	6,687	8,320
Expected return on assets	(10,063)	(9,452)
Amortization of prior service benefit	(51)	6
Total net pension and postretirement benefits (credit) cost	(2,213)	4
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	26	24
Interest cost	468	549
Total net pension and postretirement benefits (credit) cost	$ 494	$ 573