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LONG-LIVED ASSET IMPAIRMENTS (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Aug. 16, 2019	Aug. 15, 2019	Sep. 30, 2018
Asset impairment charges
Property, plant and equipment	$ 1,412,358	$ 2,008,986	$ 1,412,358
Asset impairment		15,190	40,483
Dotiki Mine
Asset impairment charges
Property, plant and equipment	51,000		$ 51,000	$ 25,800	$ 35,900	$ 85,300
Accrued payments				$ 5,100
Asset impairment	34,300	$ 15,200
Coal reserves not to exercise lease option
Asset impairment charges
Asset impairment	$ 6,200

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of expenses incurred but not yet paid classified as other.

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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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