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LONG-LIVED ASSET IMPAIRMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Aug. 16, 2019	Aug. 15, 2019
Asset impairment charges
Asset impairments	$ 24,977	$ 15,190
Total assets	2,166,016	2,586,694	$ 2,159,406
Dotiki Mine
Asset impairment charges
Total assets				$ 25,800	$ 35,900
Accrued payments				$ 5,100
Illinois Basin
Asset impairment charges
Asset impairments	23,500
Total assets	738,315	1,092,188	676,091
Illinois Basin | Dotiki Mine
Asset impairment charges
Asset impairments		7,500
Coal Royalties
Asset impairment charges
Asset impairments	1,500
Total assets	$ 288,525	292,436	$ 285,943
Coal Royalties | Dotiki Mine
Asset impairment charges
Asset impairments		$ 7,700

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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