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CAPITAL AND FINANCIAL RISK MANAGEMENT - Changes in liabilities arising from financing activities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Changes in liabilities arising from financing activities  
Beginning balance $ 1,377,178
Changes from Financing Cash Flows 343,403
Foreign Exchange (125)
Other 2,766
Ending balance 1,723,222
Long-term debt  
Changes in liabilities arising from financing activities  
Beginning balance 1,371,851
Changes from Financing Cash Flows 346,785
Other 2,672
Ending balance 1,721,308
Finance lease obligations  
Changes in liabilities arising from financing activities  
Beginning balance 5,327
Changes from Financing Cash Flows (3,382)
Foreign Exchange (125)
Other 94
Ending balance $ 1,914