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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Rental expenses | ¥ 16,436 | $ 2,526 | ¥ 17,765 | ¥ 15,805 |
Unrecognized tax positions | 70,992 |  |  |  | $ 10,911
Capital Addition Purchase Commitments [Member] |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Commitments to Acquire Certain Medical Equipment | ¥ 426,293 |  |  |  | $ 65,520

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