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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

X

- 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.

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The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to establish access to mineral reserves.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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