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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Lease, Cost | The components of the Company’s leases presented in the Consolidated Balance Sheets were as follows (in thousands):
|  | December 31,
|  | 2023 |  | 2022
Finance lease right-of-use assets, net (included in Mineral properties, plant and equipment, net) |  | $ | 84,689 |  |  | $ | 101,705 |
Operating lease right-of-use assets (included in Other non-current assets) |  |  | 21,038 |  |  |  | 17,946 |
Total lease right-of-use-assets |  | $ | 105,727 |  |  | $ | 119,651 |
Short-term finance lease liabilities (included in Finance lease liabilities) |  | $ | 4,555 |  |  | $ | 3,872 |
Short-term operating lease liabilities (included in Accrued liabilities and other) |  |  | 1,545 |  |  |  | 1,976 |
Long-term finance lease liabilities (included in Finance Lease liabilities) |  |  | 86,141 |  |  |  | 102,434 |
Long-term operating lease liabilities (included in Other non-current liabilities) |  |  | 21,009 |  |  |  | 16,969 |
Total lease liabilities |  | $ | 113,250 |  |  | $ | 125,251 |
The components of the Company’s leases presented in the Consolidated Statements of Operations for the years ended December 31 were as follows (in thousands):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Operating leases: |  |  |  |  |  |  |  |  |
Lease expense |  | $ | 3,648 |  |  | $ | 4,134 |  |  | $ | 2,986 |
Sublease income |  |  | (958) |  |  |  | — |  |  |  | — |
Finance leases: |  |  |  |  |  |  |  |  |
Amortization of lease cost |  |  | 5,346 |  |  |  | 5,346 |  |  |  | 2,517 |
Interest expense on lease liabilities |  |  | 4,645 |  |  |  | 4,830 |  |  |  | 274 |
Variable and short-term leases |  |  | 3,812 |  |  |  | 1,740 |  |  |  | 10,661 |
Total |  | $ | 16,493 |  |  | $ | 16,050 |  |  | $ | 16,438 |
The components of the Company’s leases presented in the statements of cash flows for the years ended December 31 were as follows (in thousands):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Operating leases within cash flows from operating activities |  | $ | 2,690 |  |  | $ | 4,134 |  |  | $ | 2,986 |
Finance leases within cash flows from financing activities |  | $ | 3,870 |  |  | $ | 10,091 |  |  | $ | 10,441 |
The following is a schedule of weighted-average discount rates used to determine lease liabilities and remaining lease terms for the years ended December 31:
|  | Year Ended December 31,
|  | 2023 |  | 2022
Weighted-average remaining lease term - operating leases (in years) |  | 9.9 |  | 8.4
Weighted-average remaining lease term - finance leases (in years) |  | 17.1 |  | 18.1
Weighted-average discount rate - operating leases |  | 6.6 | % |  | 5.2 | %
Weighted-average discount rate - finance leases |  | 4.5 | % |  | 4.5 | %
Lessee, Operating Lease, Liability, Maturity | The following is a schedule of future minimum lease payments under noncancellable finance and operating leases as of December 31, 2023 (in thousands):
|  | Operating Leases |  | Finance Leases
2024 |  | $ | 2,858 |  |  | $ | 8,532 |
2025 |  |  | 2,808 |  |  |  | 8,532 |
2026 |  |  | 3,379 |  |  |  | 8,532 |
2027 |  |  | 3,315 |  |  |  | 8,532 |
2028 |  |  | 2,899 |  |  |  | 8,532 |
Thereafter |  |  | 16,006 |  |  |  | 80,611 |
Total minimum lease payments |  | $ | 31,265 |  |  | $ | 123,271 |
Less: amounts representing interest |  |  | 8,711 |  |  |  | 32,575 |
Present value of net minimum lease payments |  |  | 22,554 |  |  |  | 90,696 |
Less: current portion of lease liabilities |  |  | 1,545 |  |  |  | 4,555 |
Long-term lease liabilities |  | $ | 21,009 |  |  | $ | 86,141 |
Finance Lease, Liability, Fiscal Year Maturity | The following is a schedule of future minimum lease payments under noncancellable finance and operating leases as of December 31, 2023 (in thousands):
|  | Operating Leases |  | Finance Leases
2024 |  | $ | 2,858 |  |  | $ | 8,532 |
2025 |  |  | 2,808 |  |  |  | 8,532 |
2026 |  |  | 3,379 |  |  |  | 8,532 |
2027 |  |  | 3,315 |  |  |  | 8,532 |
2028 |  |  | 2,899 |  |  |  | 8,532 |
Thereafter |  |  | 16,006 |  |  |  | 80,611 |
Total minimum lease payments |  | $ | 31,265 |  |  | $ | 123,271 |
Less: amounts representing interest |  |  | 8,711 |  |  |  | 32,575 |
Present value of net minimum lease payments |  |  | 22,554 |  |  |  | 90,696 |
Less: current portion of lease liabilities |  |  | 1,545 |  |  |  | 4,555 |
Long-term lease liabilities |  | $ | 21,009 |  |  | $ | 86,141 |

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 + Details
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