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COMMON SHARES & TREASURY SHARES (Details) - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of classes of share capital [line items]      
Number of shares issued 62,298,848 62,298,848 63,836,251
Common class A shares      
Disclosure of classes of share capital [line items]      
Number of shares issued 62,298,846 62,298,846 63,836,249
Common class B shares      
Disclosure of classes of share capital [line items]      
Number of shares issued 1 1 1
Common class C shares      
Disclosure of classes of share capital [line items]      
Number of shares issued 1 1 1