LONG-LIVED ASSET IMPAIRMENTS	6 Months Ended
Jun. 30, 2020
LONG-LIVED ASSET IMPAIRMENTS
LONG-LIVED ASSET IMPAIRMENTS	4.LONG-LIVED ASSET IMPAIRMENTS During the six months ended June 30, 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 values of the impaired assets were determined using a market approach, which represent Level 3 fair value measurements under the fair value hierarchy. The fair value analysis used assumptions regarding the 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 during the first quarter, 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 during the first quarter using undiscounted cash flows based on our estimate of both volume and prices from information available to us and determined we would be able to recover the costs of our assets, excluding the impaired assets discussed above. Amid cost reduction efforts, increased customer commitments for coal, a modest recovery in commodity futures prices and increased clarity into production levels by operators of our oil & gas mineral interests, we updated certain recoverability tests in the second quarter due to continuing weak market conditions and reaffirmed our belief we would recover the costs of our assets. 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

6 Months Ended

Jun. 30, 2020

4.LONG-LIVED ASSET IMPAIRMENTS

During the six months ended June 30, 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 values of the impaired assets were determined using a market approach, which represent Level 3 fair value measurements under the fair value hierarchy. The fair value analysis used assumptions regarding the 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 during the first quarter, 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 during the first quarter using undiscounted cash flows based on our estimate of both volume and prices from information available to us and determined we would be able to recover the costs of our assets, excluding the impaired assets discussed above. Amid cost reduction efforts, increased customer commitments for coal, a modest recovery in commodity futures prices and increased clarity into production levels by operators of our oil & gas mineral interests, we updated certain recoverability tests in the second quarter due to continuing weak market conditions and reaffirmed our belief we would recover the costs of our assets. 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.