TAXATION - Income Tax Rate Reconciliation (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
TAXATION
Statutory CIT rate	25.00%	25.00%	25.00%
-Share-based compensation expenses	0.10%	0.10%	1.10%
-Change in fair value of convertible senior notes and call options	32.00%	0.60%	0.00%
-Accrued payroll and welfare expenses	0.40%	0.50%	4.20%
-Change of enacted tax rate	(7.20%)	0.70%	(3.20%)
-Other non-deductible expenses including tax preferences	(6.60%)	(7.00%)	(19.50%)
Difference in tax rate of subsidiaries outside the PRC	(3.10%)	4.50%	0.60%
Effect of tax holiday for subsidiaries	(7.80%)	(4.60%)	(14.00%)
Change in valuation allowance	(1.30%)	2.40%	6.90%
Effective tax rate	31.50%	22.20%	1.10%

Effective income tax rate reconciliation change in fair value of convertible notes and call options.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.

+ References

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for share-based payment arrangement.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income exempt from income tax because of a tax holiday.

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