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FAIR VALUE MEASUREMENTS (Narrative) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥)
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items] |  |  |
Impairment charge, long-lived assets | ¥ 18,793 | $ 2,881 | ¥ 18,793
Nonrecurring [Member] |  |  |
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items] |  |  |
Impairment charge, long-lived assets | ¥ 0 |  |
Level 3 | Measurement Input, Discount Rate [Member] |  |  |
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items] |  |  |
Long Lived Assets Measurement Input | 14 | 14 |

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