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Fair Value Disclosure
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value Disclosure Fair Value Disclosure
Recurring Fair Value Measurements: The following table presents our assets accounted for at fair value on a recurring basis:
Fair Value Measurements at Reporting Date Using
Quoted Prices inSignificant
Active Markets forSignificant OtherUnobservable
Identical AssetsObservable InputsInputs
DescriptionDecember 31, 2024(Level 1)(Level 2)(Level 3)
Assets:
Equity securities$18,663 $18,663 $— $— 
$18,663 $18,663 $— $— 

Fair Value Measurements at Reporting Date Using
Quoted Prices inSignificant
Active Markets forSignificant OtherUnobservable
Identical AssetsObservable InputsInputs
DescriptionDecember 31, 2023(Level 1)(Level 2)(Level 3)
Assets:
Equity securities$17,208 $17,208 $— $— 
$17,208 $17,208 $— $— 

Bellaire's Mine Water Treatment Trust invests in available for sale securities that are reported at fair value based upon quoted market prices in active markets for identical assets; therefore, they are classified as Level 1 within the fair value hierarchy. The Mine Water Treatment Trust realized a gain of $1.5 million and $1.6 million in the years ended December 31, 2024 and 2023, respectively. See Note 7 for further discussion of Bellaire's Mine Water Treatment Trust.

Prior to 2023, we invested $2.0 million in equity securities of a public company with a diversified portfolio of royalty producing mineral interests. The investment is reported at fair value based upon quoted market prices in active markets for identical assets; therefore, it is classified as Level 1 within the fair value hierarchy. We recognized a gain of $0.3 million and $0.4 million in the years ended December 31, 2024 and 2023, respectively, related to the investment in these equity securities. The change in fair value of equity securities is reported on the line Gain on equity securities in the Other expense (income) section of the Consolidated Statements of Operations.

There were no transfers into or out of Levels 1, 2 or 3 during the year ended December 31, 2024.

Nonrecurring Fair Value Measurements: On December 18, 2023, MLMC received notice from its customer related to a boiler issue at the Red Hills Power Plant that began on December 15, 2023. We determined the reduction in customer demand
caused by this issue was an indicator of potential impairment as of December 31, 2023 and, as a result, reviewed MLMC's long-lived assets for impairment.

We assessed the recoverability of the MLMC asset group and determined that the assets were not fully recoverable when compared to the remaining future undiscounted cash flows from the asset group. As a result, we estimated the fair value of the asset group which resulted in a non-cash, long-lived asset impairment charge of $65.9 million. The asset impairment charge was recorded as Long-lived asset impairment charge in the Consolidated Statement of Operations for the year ended December 31, 2023. The $65.9 million relates exclusively to MLMC; however, $60.8 million and $5.1 million were recorded on the Coal Mining segment and the Minerals Management segment, respectively, as certain MLMC land assets were recorded within the Minerals Management segment. The impairment charge was allocated to the long-lived assets of the asset group on a pro rata basis using the relative carrying amount of those assets in relation to their fair value. The analysis for the land and real estate and other property, plant and equipment was calculated using market data for similar assets, which are classified as Level 2 inputs. The analysis of certain other long-term assets was calculated using unobservable inputs with little or no market data, which are classified as Level 3 inputs.

While the boiler issue at the customer's Red Hills Power Plant has been resolved, it resulted in a reduction in customer demand which had a significant impact on our results of operations during 2024. We recognized income of $13.6 million in 2024 related to business interruption insurance recoveries to partially offset losses related to the boiler outage.

Other Fair Value Measurement Disclosures: The carrying amounts of cash and cash equivalents, accounts receivable and accounts payable approximate fair value due to the short-term maturities of these instruments. The fair values of revolving credit agreements and long-term debt, excluding finance leases, were determined using current rates offered for similar obligations taking into account subsidiary credit risk, which is Level 2 as defined in the fair value hierarchy. The fair value and the book value of revolving credit agreements and long-term debt, excluding finance leases, was $97.9 million and $99.4 million, respectively, at December 31, 2024 and $35.3 million and $35.8 million, respectively, at December 31, 2023.
Financial instruments that potentially subject us to concentration of credit risk consist principally of accounts receivable. Under our mining contracts, we recognize revenue and a related receivable as coal or other aggregates are delivered or predevelopment services are provided. These mining contracts provide for monthly settlements. Our significant credit concentration is uncollateralized; however, historically minimal credit losses have been incurred. To further reduce credit risk associated with accounts receivable, we perform periodic credit evaluations of our customers, but do not generally require advance payments or collateral.