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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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- 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 + Details
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