Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Prior Service Cost Charge	$ 1,800
Defined Benefit Plan, Contributions by Employer	9,214	$ 6,310
Defined Benefit Plan Premium Refund	1,600
Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments 1	22,700
Total Contribution Amount	5,700	4,000	$ 3,100
Defined Benefit Plan Other Costs	$ 1,800
Pooled Separate account percentage	As of December 31, 2020, the U.S. pension plan pooled separate accounts included approximately 61 percent of investments in equity securities and 39 percent of investments in fixed income securities.
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 344,400	366,000
Net Periodic Benefit Cost	26,351	6,603	5,922
Gross AOCI	$ (27,484)	(68,105)
Diversified investment fund - registered investment companies measured at NAV [Member] | Defined Benefit Plan Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Additional Disclosures About Plan Assets	62.00%
Diversified investment fund - registered investment companies measured at NAV [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Additional Disclosures About Plan Assets	19.00%
Diversified investment fund - registered investment companies measured at NAV [Member] | Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Additional Disclosures About Plan Assets	19.00%
Commingled funds measured at NAV [Member] | Defined Benefit Plan Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Additional Disclosures About Plan Assets	35.00%
Commingled funds measured at NAV [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Additional Disclosures About Plan Assets	51.00%
Commingled funds measured at NAV [Member] | Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Additional Disclosures About Plan Assets	14.00%
Domestic plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 2,302	1,087
Domestic plan [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	109,500	152,900
Net Periodic Benefit Cost	23,381	2,868	1,762
Gross AOCI	(5,482)	(46,560)
Domestic plan [Member] | Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Benefit Cost	77	149	179
Gross AOCI	124	(734)
Domestic plan [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Benefit Cost	2,500	1,800	1,600
Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	6,912	5,223
Foreign [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	234,900	213,100
Net Periodic Benefit Cost	2,970	3,735	$ 4,160
Gross AOCI	(22,002)	(21,545)
Foreign [Member] | Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 250	$ 384