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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2024
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment: Property, plant and equipment, at cost, consist of the following at December 31, 2024 and 2023 (in thousands):
|  | Useful Lives (Years) |  | December 31,
2024 |  | 2023
Land |  | — |  | $ | 295,176 |  |  | $ | 297,435 |
Land improvements |  | 10 – 30 |  | 342,213 |  |  | 316,544 |
Buildings and improvements |  | 10 – 50 |  | 933,188 |  |  | 699,045 |
Machinery and equipment(a) |  | 2 – 45 |  | 8,187,422 |  |  | 6,173,463 |
Mineral rights and reserves |  | 7 – 60 |  | 1,755,770 |  |  | 1,689,013 |
Construction in progress |  | — |  | 1,009,599 |  |  | 3,058,257 |
Total |  |  |  | $ | 12,523,368 |  |  | $ | 12,233,757 |
(a)Consists primarily of (1) short-lived production equipment components, office and building equipment and other equipment with estimated lives ranging 2 – 7 years, (2) production process equipment (intermediate components) with estimated lives ranging 8 – 19 years, (3) production process equipment (major unit components) with estimated lives ranging 20 – 29 years, and (4) production process equipment (infrastructure and other) with estimated lives ranging 30 – 45 years. The cost of property, plant and equipment is depreciated generally by the straight-line method. Depletion of mineral rights is based on the units-of-production method. Depreciation expense, including depletion, amounted to $561.4 million, $398.5 million and $273.0 million during the years ended December 31, 2024, 2023 and 2022, respectively. Interest capitalized on significant capital projects in 2024, 2023 and 2022 was $49.0 million, $72.7 million and $31.1 million, respectively. In 2022, the Company announced it has been awarded a nearly $150 million grant from the U.S. Department of Energy to expand domestic manufacturing of batteries for EVs and the electric grid and for materials and components currently imported from other countries. The grant funding is intended to support a portion of the anticipated cost to construct a new, commercial-scale U.S.-based lithium concentrator facility at our Kings Mountain, North Carolina location. The grant will be received over the life of the construction period for the new facility (projected through 2028) as reimbursement for capital expenditures. To further support the restart of the Kings Mountain mine, in 2023, we announced a $90 million critical materials award from the U.S. Department of Defense. As funds are received for both of these grants, the Company will reduce the cost of the assets by the amount of the grant, and income will be recognized by the lower depreciation expense over the useful life of the assets. During the year ended December 31, 2024, the Company received $12.4 million of these funds, which reduced the cost of Property, plant and equipment on the balance sheet.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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