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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Foreign Currency Translation and change in reporting currency) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
¥ / $
Dec. 31, 2016
CNY (¥)
¥ / $
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Foreign currency translation adjustment $ 4,228 ¥ 29,356 ¥ 101 ¥ 0
Exchange rate 6.9430 6.9430