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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | $ 4,435,535 | $ 4,172,544 |
Less accumulated depreciation, depletion and amortization | (2,269,265) | (2,149,881) |
Total property, plant and equipment, net | 2,166,270 | 2,022,663 |
Depreciation | $ 287,100 | 276,400 | $ 273,800
Minimum |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Estimated useful life | 1 year |  |
Maximum |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Estimated useful life | 33 years |  |
Mining equipment and processing facilities |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | $ 2,131,697 | 1,989,541 |
Land and coal mineral rights |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 508,892 | 504,736 |
Coal reserves not subject to depletion | 14,100 | 13,400 |
Oil & gas mineral interests |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 878,083 | 853,350 |
Unproved properties | 377,500 | 411,600 |
Buildings, office equipment, improvements and other miscellaneous equipment |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 315,092 | 310,876 |
Construction, mine development and other projects in progress |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 213,579 | 184,895 |
Mine development costs |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 388,192 | 329,146 |
Mine development costs | $ 67,200 | $ 44,400 |

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- Definition Amount, before accumulated depreciation, depletion, amortization, and valuation allowance, of capitalized cost for unproved property in oil- and gas-producing activities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 55 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477916/932-235-55-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-15 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-15 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-12 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-13 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-14 + Details
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