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CAPITAL AND FINANCIAL RISK MANAGEMENT - Changes in liabilities arising from financing activities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Changes in liabilities arising from financing activities  
Beginning balance $ 1,840,936
Changes from Financing Cash Flows (177,467)
Foreign Exchange 9,628
Other 12,419
Ending balance 1,685,516
Long-term debt  
Changes in liabilities arising from financing activities  
Beginning balance 1,724,108
Changes from Financing Cash Flows (161,597)
Other 2,730
Ending balance 1,565,241
Lease obligations  
Changes in liabilities arising from financing activities  
Beginning balance 116,828
Changes from Financing Cash Flows (15,870)
Foreign Exchange 9,628
Other 9,689
Ending balance $ 120,275