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CAPITAL AND FINANCIAL RISK MANAGEMENT - Changes in liabilities arising from financing activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in liabilities arising from financing activities    
Beginning balance $ 1,214,540  
Cash Flows 160,831  
Foreign Exchange 690  
Other 1,117  
Ending balance 1,377,178  
Long-term portion of finance lease obligations (note 13(a)) 1,915 $ 6,319
Current portion of long-term debt    
Changes in liabilities arising from financing activities    
Beginning balance 129,896  
Cash Flows (130,412)  
Foreign Exchange 516  
Long-term debt    
Changes in liabilities arising from financing activities    
Beginning balance 1,072,790  
Cash Flows 296,495  
Other 2,566  
Ending balance 1,371,851  
Finance lease obligations    
Changes in liabilities arising from financing activities    
Beginning balance 11,854  
Cash Flows (5,252)  
Foreign Exchange 174  
Other (1,449)  
Ending balance $ 5,327