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FAIR VALUE MEASUREMENTS (Schedule of Fair Value Measurements for Each Class of Assets on Nonrecurring Basis) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
FAIR VALUE MEASUREMENTS [Line Items]
Total losses	¥ 0	$ 0	¥ 713	¥ 33,731
Nonrecurring [Member]
FAIR VALUE MEASUREMENTS [Line Items]
Total losses	(1,507)
Long-lived assets held and used	631
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
FAIR VALUE MEASUREMENTS [Line Items]
Long-lived assets held and used	0
Nonrecurring [Member] | Significance Other Observable Inputs (Level 2) [Member]
FAIR VALUE MEASUREMENTS [Line Items]
Long-lived assets held and used	0
Nonrecurring [Member] | Significant unobservable inputs (Level 3) [Member]
FAIR VALUE MEASUREMENTS [Line Items]
Long-lived assets held and used	¥ 631

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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- Definition

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+ References

No definition available.

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