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CASH, CASH EQUIVALENTS AND RESTRICTED CASH (Summary of Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Cash and cash equivalents ¥ 211,436 $ 30,752 ¥ 195,303   ¥ 196,900  
Restricted cash 30,072 4,374 2,350   2,350  
Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows ¥ 241,508 $ 35,126 ¥ 197,653 $ 28,747 ¥ 199,250 ¥ 248,353