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FINANCIAL RISK MANAGEMENT - Credit Risk (Details) - Credit risk - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 478,184 $ 510,866
Cash and cash equivalents    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 419,212 459,864
Value added tax receivable    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 18,802 13,755
Trade receivables and other assets    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 11,287 14,848
Other financial assets    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk   $ 22,399