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APPLICATION OF NEW AND AMENDMENTS TO INTERNATIONAL FINANCIAL REPORTING STANDARDS - IFRS 15 Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
APPLICATION OF NEW AND AMENDMENTS TO INTERNATIONAL FINANCIAL REPORTING STANDARDS    
Contract assets $ 731  
Trade and other receivables $ 20,535 $ 34,582
Trade and other receivables and contract assets   34,582
Impact of adopting IFRS 15    
APPLICATION OF NEW AND AMENDMENTS TO INTERNATIONAL FINANCIAL REPORTING STANDARDS    
Contract assets   819
Trade and other receivables   (819)
After application of IFRS 15    
APPLICATION OF NEW AND AMENDMENTS TO INTERNATIONAL FINANCIAL REPORTING STANDARDS    
Contract assets   819
Trade and other receivables   33,763
Trade and other receivables and contract assets   $ 34,582