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PROPERTY, PLANT AND EQUIPMENT - Summary (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | $ 3,608,347 | $ 3,554,090 |
Less accumulated depreciation, depletion and amortization | (1,909,669) | (1,753,845) |
Total property, plant and equipment, net | 1,698,678 | 1,800,245 |
Depreciation | 256,900 | 297,000 | $ 312,400
Mining Equipment |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 1,896,470 | 1,896,324 |
Land And Mineral Rights |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 458,440 | 454,310 |
Coal reserves not subject to depletion | 37,400 | 37,500 |
Oil and gas mineral interests |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 647,864 | 616,904 |
Unproved properties | 355,100 | 340,500 |
Buildings, Office Equipment And Improvements |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 282,902 | 279,938 |
Construction and mine development in progress |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | 44,217 | 25,799 |
Mine development costs |  |  |
PROPERTY, PLANT AND EQUIPMENT |  |  |
Property, plant and equipment, at cost | $ 278,454 | 280,815 |
Mine development costs |  | $ 13,100 |

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- Definition Represents the carrying value as of the balance sheet date of coal reserves attributable to properties where the entity is not currently engaged in operations or leasing to third parties and therefore the coal reserves are not being depleted. + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 932 -URI http://asc.fasb.org/topic&trid=2145477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61901-109447 + Details
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