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LONG-TERM INVESTMENTS (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Equity investments without readily determinable fair values ¥ 22,160 $ 3,223 ¥ 22,160  
Equity method investments 366,204 53,262 732,167 ¥ 181,500
Long-term Investments ¥ 388,364 $ 56,485 ¥ 754,327