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INCOME TAXES (Aggregate amount and per share effect of the tax holiday and preferential tax rate) (Details)
¥ / shares in Units, ¥ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
¥ / shares
Aggregate amount and per share effect of the tax holiday and preferential tax rate  
The aggregate amount of tax holiday and preferential tax rate | ¥ ¥ 265,545
The aggregate effect on basic and diluted net income per share:  
- Basic ¥ 2.2458
- Diluted ¥ 2.2326