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TAXATION (Narrative) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |
Applicable tax rates | 25.00% | 25.00% | 25.00% | 25.00% |  |
Income tax profits | ¥ | ¥ 0 |  | ¥ 0 | ¥ 0 |  |
Income tax liabilities, interest rate | 0.05% | 0.05% |  |  |  |
Income tax liabilities, penalty rate | 50.00% | 50.00% |  |  |  |
Uncertain tax position, impact on taxes | ¥ 2,770 | $ 426 | 1,467 | 9,041 |  |
Accrued interest and penalties | 29,634 |  | 26,864 |  | $ 4,554 |
Undistributed earnings | 571,963 |  | 63,208 |  | 87,909 | $ 9,715
Undistributed earnings, which are not subject to withholding tax under prevailing tax law | $ |  |  |  |  | 51,457 | 7,909
Unrecognized Tax Benefits | 41,358 |  | ¥ 38,420 | ¥ 36,090 | 6,356 | 5,905
Income Tax Examination, Penalties and Interest Expense | 70,992 | $ 10,911 |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | ¥ 18,381 |  |  |  | $ 2,825 | $ 21,300
Property Leasing Arrangement [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Value added tax | 17.00% | 17.00% |  |  |  |
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 | 35.00% | 35.00% |  |  |  |

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