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FAIR VALUE MEASUREMENTS (Narrative) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Impairment charge, long-lived assets held and used | ¥ 23,659 | $ 3,441 | ¥ 60,162 |  |
Assets Held-for used, Long Lived, Fair Value Disclosure | 7,885 |  |  | $ 1,147 |
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Fair value, long-lived assets held and used | 117 |  | ¥ 632 | 17 | $ 97
Impairment charge, long-lived assets held and used | 7,768 | $ 1,130 |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Fair value, long-lived assets held and used | ¥ 117 |  |  | $ 17 |
Level 3 [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Long Lived Assets Measurement Input | 14 |  |  | 14 |
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Fair value, long-lived assets held and used |  |  |  | $ 117 | $ 632

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