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BASIS OF PREPARATION OF THESE CONSOLIDATED FINANCIAL STATEMENTS - Effect of Adoption of IFRS 16 (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of initial application of standards or interpretations [line items]      
Right-of-use asset $ 58,781    
Lease liabilities 61,363 $ 46,887 $ 46,887
Retained earnings $ 239,378   $ 187,335
IFRS 16      
Disclosure of initial application of standards or interpretations [line items]      
Right-of-use asset   46,567  
Prepayments   (1,652)  
Lease liabilities   46,887  
Retained earnings   $ (1,972)