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SUPPLEMENTAL CASH FLOW INFORMATION - Non-cash Investing and Financing Transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Cash Flow Statement [Abstract] |  |
Consideration issued for acquisition of Alacer | $ (2,179,647) | $ 0
Acquisition of net assets in exchange for a receivable | 12,576 | 0
Reclamation and closure cost provision assumed in land acquisition | 0 | (12,990)
Transfer of share-based payment reserve upon exercise of stock options | (2,976) | (2,804)
Transfer of equity-settled PSUs | 0 | 1,356
Transfer of cash-settled RSUs and PSUs | (4,138) | 0
Extinguishment of loan receivable in connection with the acquisition of non-controlling interest | 0 | 11,369
Non-cash consideration for acquisition of non-controlling interest | 0 | (30,101)
Other non-cash investing and financing transactions | 2,643 | 0
Non-cash investing and financing transactions | $ (2,171,542) | $ (33,170)

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