Fair Value Disclosure |
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| Fair Value Disclosures [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value Disclosure | Fair Value Disclosure Recurring Fair Value Measurements: The following table presents our assets and liabilities accounted for at fair value on a recurring basis:
Bellaire is our non-operating subsidiary with legacy liabilities relating to closed mining operations. Prior to 2024, Bellaire contributed $5.0 million to establish a mine water treatment trust (Mine Water Treatment Trust) to assure the long-term treatment of post-mining discharge. Bellaire's Mine Water Treatment Trust invests in equity 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 fair value of the Mine Water Treatment Trust was $12.1 million and $12.3 million at March 31, 2025 and December 31, 2024, respectively, and is recognized as a component of Equity securities in the accompanying Unaudited Condensed Consolidated Balance Sheets. We recognized a loss of $0.3 million and a gain of $0.7 million during the three months ended March 31, 2025 and 2024, respectively, related to the Mine Water Treatment Trust. Prior to 2024, 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. The fair value of this investment was $5.7 million and $6.3 million at March 31, 2025 and December 31, 2024, respectively, and is recognized as a component of Equity securities in the accompanying Unaudited Condensed Consolidated Balance Sheets. We recognized a loss of $0.6 million and a gain of $0.4 million during the three months ended March 31, 2025 and 2024, respectively, related to the investment in these equity securities. The change in fair value of equity securities is reported on the line Loss (gain) on equity securities in the Other expense (income) section of the Unaudited Condensed Consolidated Statements of Operations. There were no transfers into or out of Levels 1, 2 or 3 during the three months ended March 31, 2025 and 2024.
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