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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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