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EARNINGS (LOSSES) PER SHARE - Computation of diluted earnings (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities which could potentially dilute basic earnings per share which were excluded from the computation of diluted earnings per share	25,422,897	530,009
Outstanding employee options and nonvested restricted stocks
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities which could potentially dilute basic earnings per share which were excluded from the computation of diluted earnings per share	7,095,408	530,009
Shares of convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities which could potentially dilute basic earnings per share which were excluded from the computation of diluted earnings per share	18,327,489

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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