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RESTRICTED NET ASSETS (Narrative) (Details) - 12 months ended Dec. 31, 2019 ¥ in Thousands, $ in Thousands | USD ($) | CNY (¥)
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Restricted Net Assets [Line Items] |  |
Percentage of after-tax profit to general reserve | 10.00% |
Amount of net assets restricted | $ 685,188 | ¥ 4,770,139
Foreign Tax Authority [Member] |  |
Restricted Net Assets [Line Items] |  |
Percentage of after-tax profit to general reserve | 10.00% |
Percentage of general reserve registered capital | 50.00% |
Domestic Tax Authority [Member] |  |
Restricted Net Assets [Line Items] |  |
Percentage of after-tax profit to general reserve | 10.00% |
Percentage of general reserve registered capital | 50.00% |

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