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PROPERTY, PLANT AND EQUIPMENT - Summary (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019
PROPERTY, PLANT AND EQUIPMENT |  |
Property, plant and equipment, at cost | $ 2,925,808 | $ 3,684,008
Less accumulated depreciation, depletion and amortization | (1,513,450) | (1,675,022)
Total property, plant and equipment, net | 1,412,358 | 2,008,986
Mining equipment and processing facilities |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Property, plant and equipment, at cost | 1,851,479 | 1,937,642
Land and coal mineral rights |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Property, plant and equipment, at cost | 445,411 | 453,237
Coal reserves not subject to depletion | 49,200 | 40,100
Oil and gas mineral interests |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Property, plant and equipment, at cost |  | 618,282
Unproved properties |  | 376,200
Buildings, office equipment and improvements |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Property, plant and equipment, at cost | 287,053 | 304,111
Construction and mine development in progress |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Property, plant and equipment, at cost | 71,190 | 86,876
Mine development costs |  |
PROPERTY, PLANT AND EQUIPMENT |  |
Property, plant and equipment, at cost | 270,675 | 283,860
Capitalized development costs of mines in development phase |  | $ 13,200
Decrease in mine development costs | $ 9,900 |

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