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Lease Obligations (Schedule of Lease Obligations) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of quantitative information about right-of-use assets [line items] |  |
Operating leases | $ 31,703 | $ 37,792
Less: future finance charges | (12,206) | (13,913)
Present value of minimum lease payments | 19,497 | 23,879
Less current portion | (6,978) | (8,831)
Non-current portion | 12,519 | 15,048
Lease Obligation Mining Equipment |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Operating leases | 16,829 |
Lease Obligation Other Leases |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Operating leases | 2,668 |
Less than one year |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Operating leases | 7,367 | 9,313
Between one and five years |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Operating leases | 10,209 | 13,521
More than five years |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Operating leases | $ 14,127 | $ 14,958

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- Definition Minimum finance lease payments payable at present value IFRS16. + References No definition available. + Details
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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 58 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_58&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph B11D -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_B11D_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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