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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured Using Unobservable Inputs) (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Capped Call Options [Member]      
Balance ¥ 0 ¥ 17,490,323 ¥ 21,098,263
Foreign exchange (gain)/loss 0 736,212 2,562,342
Change in fair value of capped call options 0 (18,226,535) (6,170,282)
Balance 0 0 17,490,323
Convertible Senior Notes [Member]      
Balance 423,739,708 1,506,981,361 1,540,398,645
Issuance of convertible senior notes 0 0
Foreign exchange (gain)/loss (845,071) 43,448,795 96,678,461
Change in fair value of convertible senior notes 0 92,015,957 8,400,918
Repurchase of convertible senior notes (422,829,295) (1,218,706,405) (138,496,663)
Balance ¥ 65,342 ¥ 423,739,708 ¥ 1,506,981,361