Pension Plans (Details) - Subsequent Event - Korea - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2020	Oct. 31, 2020
Defined Contribution Plan Disclosure [Line Items]
Payment for Pension and Other Postretirement Benefits	$ 30,000
Conversion of severance plan obligation to defined benefit liability		$ 30,000

Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585

Name:	us-gaap_PensionAndOtherPostretirementBenefitContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration