Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

SUBSEQUENT EVENTS (Details)	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Subsequent Event [Line Items]
Debt Instrument, Face Amount			$ 6,000,000	¥ 300,000,000	¥ 800,000,000
Convertible bond due 2019 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount		$ 150,000,000
Subsequent Event [Member] \| Convertible bond due 2019 [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount	$ 10.000