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TAXATION (Narrative) (Details) ¥ in Thousands, $ in Thousands | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Applicable tax rates |  |  | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% | 25.00% |
Income tax profits |  |  |  |  |  | $ 0 |  | $ 0 |
Uncertain tax position, impact on taxes |  |  | ¥ 8,309 | $ 1,208 | ¥ 2,770 |  | ¥ 1,467 |  |
Accrued interest and penalties |  | ¥ 37,943 | 37,943 |  | 29,634 |  |  |  | $ 5,519
Income Tax Examination, Penalties and Interest Expense |  |  | 118,943 | 17,300 | 70,992 |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 46,978 | 46,978 |  | 18,381 |  |  |  | 6,833
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  | 225,246 | $ 32,761 | 253,895 |  | ¥ 204,598 |  |
Deferred Tax Assets, Net of Valuation Allowance |  | ¥ 696 | ¥ 696 |  | ¥ 9,566 |  |  |  | $ 101
Property Leasing Arrangement [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Value added tax | 17.00% | 16.00% |  |  |  |  |  |  |
Technical Service [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Value added tax |  |  | 6.00% | 6.00% |  |  |  |  |
United States of America [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Applicable tax rates |  |  | 21.00% | 21.00% | 35.00% | 35.00% | 35.00% | 35.00% |

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