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LONG-LIVED ASSET IMPAIRMENTS (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Aug. 16, 2019	Aug. 15, 2019
Asset impairment charges
Asset impairments	$ 15,190	$ 24,977	$ 15,190
Property, plant and equipment		1,860,922		$ 2,008,986
Illinois Basin
Asset impairment charges
Asset impairments		$ 25,000	$ 15,200
Property, plant and equipment					$ 25,800	$ 35,900
Accrued payments					$ 5,100

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Amount recognized as an operating expense or loss during the period to reduce the carrying amount of a project that has been impaired but not abandoned.

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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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