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LONG-LIVED ASSET IMPAIRMENTS	12 Months Ended
	Dec. 31, 2019
LONG-LIVED ASSET IMPAIRMENTS
LONG-LIVED ASSET IMPAIRMENTS	4. LONG-LIVED ASSET IMPAIRMENTS ​ We ceased coal production effective August 16, 2019 at our Dotiki mine to focus on shifting production to our other lower-cost mines in our Illinois Basin segment.  Accordingly, we adjusted the carrying value of Dotiki's assets from $35.9 million to its fair value of $25.8 million and accrued scheduled payments of $5.1 million to WKY CoalPlay for leased reserves from which we may not receive future economic benefit. The resulting impairment charge totaled $15.2 million.  See Note 11 – Variable Interest Entities for more information about WKY CoalPlay.  Previously, in the fourth quarter of 2018, we reduced Dotiki’s economic mine life which resulted in a $34.3 million impairment charge, and the related adjustment of Dotiki’s asset carrying value from $85.3 million to its fair value of $51.0 million.  Also in the fourth quarter of 2018, a decrease in the fair value of an option entitling us to lease certain coal reserves within the Illinois Basin Segment resulted in an impairment charge of $6.2 million. ​ The fair value of the impaired assets was determined using a combination of market and income approaches, both of which represent Level 3 fair value measurements under the fair value hierarchy. The fair value analysis used assumptions of marketability of certain assets as well as discounted cash flows over the remaining life of the assets. ​ See Note 2 – Summary of Significant Accounting Policies – Long-Lived Asset Impairment for more information on our accounting policy for asset impairments.

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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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