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COMMITMENTS AND CONTINGENCIES (Narrative) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
USD ($)
Long-term Purchase Commitment [Line Items]          
Rental expenses ¥ 15,457 $ 2,248 ¥ 16,436 ¥ 17,765  
Unrecognized tax positions 118,943       $ 17,300
Capital Addition Purchase Commitments [Member]          
Long-term Purchase Commitment [Line Items]          
Commitments to Acquire Certain Medical Equipment ¥ 660,758   ¥ 426,293   $ 96,103