LONG-LIVED ASSET IMPAIRMENTS	3 Months Ended
Mar. 31, 2020
LONG-LIVED ASSET IMPAIRMENTS
LONG-LIVED ASSET IMPAIRMENTS	4.LONG-LIVED ASSET IMPAIRMENTS During the three months ended March 31, 2020, we recorded $25.0 million of non-cash asset impairment charges in our Illinois Basin 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. The fair value of the impaired assets was determined using a market approach, which represents Level 3 fair value measurement under the fair value hierarchy. The fair value analysis used assumptions of marketability of certain assets in the Illinois Basin. With the uncertainty related to energy demand as a result of a) weak electricity demand and b) an oversupply and lack of storage for oil and natural gas, both due in part to the COVID-19 pandemic and other market and production factors impacting both our coal mining operations and our mineral interests activities, we performed recoverability tests using undiscounted cash flows based on our estimate of both volume and prices from information available to us. While we currently believe that we will recover the costs of our assets, excluding the impaired assets discussed above, the cash flow estimates used in our assessment, by their very nature, are dependent on conditions that could materially change in future periods based on new information. If in future periods changes to these estimates were to materially reduce our expected cash flows, additional impairments could be necessary.

LONG-LIVED ASSET IMPAIRMENTS

3 Months Ended

Mar. 31, 2020

4.LONG-LIVED ASSET IMPAIRMENTS

During the three months ended March 31, 2020, we recorded $25.0 million of non-cash asset impairment charges in our Illinois Basin 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. The fair value of the impaired assets was determined using a market approach, which represents Level 3 fair value measurement under the fair value hierarchy. The fair value analysis used assumptions of marketability of certain assets in the Illinois Basin.

With the uncertainty related to energy demand as a result of a) weak electricity demand and b) an oversupply and lack of storage for oil and natural gas, both due in part to the COVID-19 pandemic and other market and production factors impacting both our coal mining operations and our mineral interests activities, we performed recoverability tests using undiscounted cash flows based on our estimate of both volume and prices from information available to us. While we currently believe that we will recover the costs of our assets, excluding the impaired assets discussed above, the cash flow estimates used in our assessment, by their very nature, are dependent on conditions that could materially change in future periods based on new information. If in future periods changes to these estimates were to materially reduce our expected cash flows, additional impairments could be necessary.