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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT (Market risk narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 3,221,907 $ 1,218,635
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 $ 4,900 4,900
Net investments exposed to volatility in exchange rate, amount 1,200,000  
Reasonably possible change in risk variable, impact on equity $ 11,900 10,400
Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Reasonably possible change in risk variable, percent 10000.00%  
Reasonably possible change in risk variable, impact on pre-tax earnings $ 20,500 13,500
Argentina, Pesos | Currency risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Devaluation, percent 14.80%  
Change in risk variable, impact on comprehensive income $ 97,000  
Change in risk variable, impact on profit and loss $ 47,000  
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on pre-tax earnings $ 1,100 700
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 $ 4,300 5,500
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 $ 100
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 $ 1,900  
Weighted average    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.76% 6.92%
Floating Rate    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 2,075,276 $ 813,709
Floating Rate | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings $ 2,075,000 $ 814,000
Borrowings, percentage of total borrowings 64.40% 66.80%