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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | $ 4,172,544 | $ 3,931,422 |
Less accumulated depreciation, depletion and amortization | (2,149,881) | (2,050,754) |
Total property, plant and equipment, net | 2,022,663 | 1,880,668 |
Depreciation | $ 276,400 | 273,800 | $ 260,300
Minimum |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Estimated useful life | 1 year |  |
Maximum |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Estimated useful life | 20 years |  |
Mining Equipment |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | $ 1,989,541 | 1,927,603 |
Land And Mineral Rights |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 504,736 | 499,950 |
Coal reserves not subject to depletion | 13,400 | 29,900 |
Oil and gas mineral interests |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 853,350 | 814,667 |
Unproved properties | 411,600 | 422,700 |
Buildings, Office Equipment And Improvements |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 310,876 | 300,436 |
Construction and mine development in progress |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 184,895 | 99,042 |
Mine development costs |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 329,146 | 289,724 |
Mine development costs | $ 44,400 | $ 11,300 |

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- Definition Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 932 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//932/tableOfContent Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-13 + Details
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