SHARE-BASED PAYMENTS - Incentive payments based on shares (Details)
Sep. 08, 2017
USD ($)
installment
shares
Plan of incentives through shares  
SHARE-BASED PAYMENTS  
Number of shares granted 225,000
Percentage of shares that would be delivered 100.00%
Shares allocated individually | shares 360,000
Plan Of Incentives Through Shares, Three To Four Year Plan  
SHARE-BASED PAYMENTS  
Number of shares granted 225,000
Minimum fulfillment of goals (as a percent) 70.00%
Maximum fulfillment of goals (as a percent) 100.00%
Period of duty of permanence 12 months
Plan Of Incentives Through Shares, Three Year Plan  
SHARE-BASED PAYMENTS  
Number of shares granted 225,000
Minimum fulfillment of goals (as a percent) 70.00%
Maximum fulfillment of goals (as a percent) 100.00%
Period of duty of permanence 4 years
Plan Of Incentives Through Shares, 360,000 Shares  
SHARE-BASED PAYMENTS  
Portion in installment (as a percent) 50.00%
Plan Of Incentives Through Shares, First Half Of 360,000 Shares  
SHARE-BASED PAYMENTS  
Number of installments | installment 3
Plan Of Incentives Through Shares, Second Half Of 360,000 Shares  
SHARE-BASED PAYMENTS  
Period of achievement of condition 3 years