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TAXATION - Reconciliation Between the Statutory Tax Rate and the Effective Tax Rate (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of the Differences Between Statutory Tax Rate and the Effective Tax Rate      
EIT statutory rate 25.00% 25.00% 25.00%
Difference in EIT rates of certain subsidiaries (22.00%) (11.00%) (20.00%)
Change in fair value of convertible senior notes 25.00% (2.00%) 23.00%
Expenses incurred outside the PRC 7.00% 5.00% 5.00%
Other permanent differences (4.00%) (1.00%) (2.00%)
Effective EIT rate of the Group 31.00% 16.00% 31.00%