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FINANCIAL RISK MANAGEMENT (Market risk narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 2,036,957 $ 3,221,907
Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on pre-tax earnings $ 5,000 4,900
Net investments exposed to volatility in exchange rate, amount 1,800,000  
Reasonably possible change in risk variable, impact on equity $ 17,700 11,900
Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on pre-tax earnings $ 26,800 $ 20,500
Argentina, Pesos | Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Devaluation, percent 50.50% 14.80%
Change in risk variable, impact on comprehensive income $ (387,000) $ (97,000)
Change in risk variable, impact on profit and loss (188,000) (47,000)
Effect of inflation adjustment $ 173,000  
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on pre-tax earnings $ (2,100) (1,100)
Mexico, Pesos | Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on pre-tax earnings $ 5,800 4,300
Colombia, Pesos | Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on pre-tax earnings $ (200) (200)
Brazil, Brazil Real | Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on pre-tax earnings $ 1,500 $ 1,900
Weighted average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 3.65% 4.76%
Floating Rate    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 1,747,074 $ 2,075,276
Floating Rate | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 1,747,000 $ 2,075,000
Borrowings, percentage of total borrowings 85.80% 64.40%
Floating Rate | Argentina, Pesos    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 0 $ 2,377
Floating Rate | Colombia, Pesos    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 0 $ 11,793