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RESTRICTED NET ASSETS (Narrative) (Details) - 12 months ended Dec. 31, 2017 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Restricted Net Assets [Line Items]
Percentage of annual appropriations after-tax income	10.00%
Amount of net assets restricted	¥ 1,859,425	$ 285,788
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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Percentage Of Profit After Tax For Appropriation To General Reserve

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Restricted Net Assets [Line Items]

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(23)(a)(4)(i))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-03(30)(a)(3)(ii))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21346-112643

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21332-112643

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