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FAIR VALUE MEASUREMENTS (Narrative) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 USD ($)
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Fair value, long-lived assets held and used	¥ 632				$ 97
Impairment charge, long-lived assets held and used	31,437	$ 4,832	¥ 7,619	¥ 4,220
Assets Held-for used, Long Lived, Fair Value Disclosure	2,138				$ 329
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Impairment charge, long-lived assets held and used	¥ 1,507	$ 232
Level 3 [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Discount rate	14.00%	14.00%

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Fair value portion of assets classified as held for used.

+ References

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Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 225
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84241808&loc=d3e92212-112881

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