Amount of investment in equity method investee and investment in and advance to affiliate.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Non-Consolidated Affiliates - Investments in Non-Consolidated Equity Method Affiliates (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Sep. 01, 2018
Related Party Transaction [Line Items]
Investment in YFVIC	$ 60,000	$ 48,000	$ 300
YFVIC
Related Party Transaction [Line Items]
Investment in YFVIC	50,000	43,000
Others
Related Party Transaction [Line Items]
Investment in YFVIC	$ 10,000	$ 5,000