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LEASES - Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Leases [Abstract] |  |
Finance lease right-of-use assets, net (included in Mineral properties, plant and equipment, net) | $ 114,882 | $ 112,808
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Mineral properties, plant and equipment, net | Mineral properties, plant and equipment, net
Operating lease right-of-use assets (included in Other non-current assets) | $ 7,530 | $ 9,362
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other non-current assets | Other non-current assets
Total lease right-of-use-assets | $ 122,412 | $ 122,170
Short-term finance lease liabilities (included in Finance lease liabilities) | 12,439 | 3,568
Short-term operating lease liabilities (included in Accrued liabilities and other) | $ 2,238 | $ 1,954
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Accrued liabilities and other | Accrued liabilities and other
Long-term finance lease liabilities (included in Finance Lease liabilities) | $ 105,965 | $ 109,544
Long-term operating lease liabilities (included in Other non-current liabilities) | $ 5,525 | $ 7,530
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other non-current liabilities | Other non-current liabilities
Total lease liabilities | $ 126,167 | $ 122,596

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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