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FINANCIAL RISK MANAGEMENT - Liquidity Risk (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Lease liabilities | $ 122,715 | $ 3,792 | $ 4,310
Liquidity risk |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Accounts payable and accrued liabilities | 123,534 |  |
Convertible notes (principal portion) | 230,000 |  |
Term loans and other debt (principal portion) | 213,088 |  |
Interest payments on debt | 44,800 |  |
Lease liabilities | 186,399 |  |
Derivative liabilities | 3,881 |  |
Reclamation and closure costs | 139,442 |  |
Operating expenditure commitments | 3,652 |  |
Capital expenditure commitments | 20,077 |  |
Other | 1,353 |  |
Total contractual obligations | 966,226 |  |
Liquidity risk | Less than one year |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Accounts payable and accrued liabilities | 123,534 |  |
Convertible notes (principal portion) | 0 |  |
Term loans and other debt (principal portion) | 71,025 |  |
Interest payments on debt | 12,840 |  |
Lease liabilities | 12,452 |  |
Derivative liabilities | 3,764 |  |
Reclamation and closure costs | 1,840 |  |
Operating expenditure commitments | 2,900 |  |
Capital expenditure commitments | 20,077 |  |
Other | 696 |  |
Total contractual obligations | 249,128 |  |
Liquidity risk | 1 - 3 years |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Accounts payable and accrued liabilities | 0 |  |
Convertible notes (principal portion) | 0 |  |
Term loans and other debt (principal portion) | 142,063 |  |
Interest payments on debt | 17,585 |  |
Lease liabilities | 21,376 |  |
Derivative liabilities | 117 |  |
Reclamation and closure costs | 13,248 |  |
Operating expenditure commitments | 752 |  |
Capital expenditure commitments | 0 |  |
Other | 330 |  |
Total contractual obligations | 195,471 |  |
Liquidity risk | 4-5 years |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Accounts payable and accrued liabilities | 0 |  |
Convertible notes (principal portion) | 0 |  |
Term loans and other debt (principal portion) | 0 |  |
Interest payments on debt | 11,500 |  |
Lease liabilities | 19,522 |  |
Derivative liabilities | 0 |  |
Reclamation and closure costs | 2,064 |  |
Operating expenditure commitments | 0 |  |
Capital expenditure commitments | 0 |  |
Other | 327 |  |
Total contractual obligations | 33,413 |  |
Liquidity risk | After 5 years |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Accounts payable and accrued liabilities | 0 |  |
Convertible notes (principal portion) | 230,000 |  |
Term loans and other debt (principal portion) | 0 |  |
Interest payments on debt | 2,875 |  |
Lease liabilities | 133,049 |  |
Derivative liabilities | 0 |  |
Reclamation and closure costs | 122,290 |  |
Operating expenditure commitments | 0 |  |
Capital expenditure commitments | 0 |  |
Other | 0 |  |
Total contractual obligations | $ 488,214 |  |

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