Pension and Retirement Plans - Schedule of Effect on One-percentage-point Change in Assumed Health Care Cost Trend Rates (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Compensation And Retirement Disclosure [Abstract]
Effect on postretirement benefit obligation, one percentage point increase	$ 2
Effect on postretirement benefit obligation, one percentage point decrease	$ (2)

Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration