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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured Using Unobservable Inputs) (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Capped Call Options [Member]      
Balance ¥ 0 ¥ 0 ¥ 17,490,323
Foreign exchange (gain)/loss 0 0 736,212
Change in fair value of capped call options 0 0 (18,226,535)
Balance 0 0 0
Convertible Senior Notes [Member]      
Balance 65,342 423,739,708 1,506,981,361
Foreign exchange (gain)/loss 3,290 (845,071) 43,448,795
Change in fair value of convertible senior notes 0 0 92,015,957
Repurchase of convertible senior notes 0 (422,829,295) (1,218,706,405)
Balance ¥ 68,632 ¥ 65,342 ¥ 423,739,708