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COMMON SHARES AND TREASURY SHARES (Details) - shares
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [line items]      
Number of shares issued 74,748,250 74,218,848 62,298,848
A-shares      
Disclosure of classes of share capital [line items]      
Number of shares issued 74,748,248 74,218,846 62,298,846
B-shares      
Disclosure of classes of share capital [line items]      
Number of shares issued 1 1 1
C-shares      
Disclosure of classes of share capital [line items]      
Number of shares issued 1 1 1