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LONG-LIVED ASSET IMPAIRMENTS	6 Months Ended
	Jun. 30, 2021
LONG-LIVED ASSET IMPAIRMENTS
LONG-LIVED ASSET IMPAIRMENTS	2.LONG-LIVED ASSET IMPAIRMENTS ​ During the first quarter of 2020, we recorded $23.5 million of non-cash asset impairment charges in our Illinois Basin Coal Operations segment due to sealing our idled Gibson North mine, resulting in its permanent closure, and a decrease in the fair value of certain mining equipment at our idled operations and greenfield coal reserves as a result of weakened coal market conditions. During the same period, we also recorded an asset impairment charge of $1.5 million in our Coal Royalties segment due to a decrease in the fair value of greenfield coal reserves held by Alliance Resource Properties near our coal mining operations in the Illinois Basin. See Note 16 – Segment Information for more information about our segments. ​ The fair values of the impaired assets were determined using a market approach, which represents Level 3 fair value measurements under the fair value hierarchy.  The fair value analysis used assumptions regarding the marketability of certain mining and reserve assets near our Illinois Basin coal mining operations.

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The entire disclosure for the details of the charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Disclosure may also include a description of the impaired asset and facts and circumstances leading to the impairment, amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired asset is reported.

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