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RESTRICTED NET ASSETS (Narrative) (Details) - 12 months ended Dec. 31, 2019 ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
Restricted Net Assets [Line Items]
Percentage of after-tax profit to general reserve	10.00%
Amount of net assets restricted	$ 685,188	¥ 4,770,139
Foreign Tax Authority [Member]
Restricted Net Assets [Line Items]
Percentage of after-tax profit to general reserve	10.00%
Percentage of general reserve registered capital	50.00%
Domestic Tax Authority [Member]
Restricted Net Assets [Line Items]
Percentage of after-tax profit to general reserve	10.00%
Percentage of general reserve registered capital	50.00%

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- Definition

Maximum Percentage Of General Reserve Registered Capital

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- Definition

Minimum Percentage Of After Tax Profit For General Reserve

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Restricted Net Assets [Line Items]

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- Definition

A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 45
-Paragraph 4
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-Publisher FASB
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-Subparagraph (SX 210.7-03(23)(a)(4)(i))
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