Commitments and Contingencies	3 Months Ended
Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Surety Bonds and Restricted Cash As the owner of the Five Forks Mine, the Company is required to post a surety bond with a regulatory commission related to performance requirements associated with the Five Forks Mine. As of March 31, 2026, the amount of this surety bond was $7.5 million. The Company leases land adjacent to the Corbin Facility and is required to post surety bonds with a regulatory commission for reclamation. As of March 31, 2026, the amount of these surety bonds was $3.0 million. The Company holds permits for an abandoned mine in West Virginia ("Mine 4") and is required to post a surety bond with a regulatory commission for reclamation. As of March 31, 2026, the amount of this surety bond was $0.7 million. As of March 31, 2026 and December 31, 2025, the Company posted cash collateral of $9.2 million and $8.5 million, respectively, as required by the Company's surety bond providers, which is reported as long-term restricted cash in the Condensed Consolidated Balance Sheets. As of March 31, 2026, the Company holds a deposit of $0.4 million with a third party for collateral as required under a bonding arrangement for Mine 4. This deposit is included in "Other long-term assets, net" in the Condensed Consolidated Balance Sheets as of March 31, 2026. From time to time, the Company will enter into customer supply agreements which require the Company to obtain performance bonds equal to the annual contract values. The most significant of these was renewed January 1, 2026 and requires the Company to post a performance bond in an amount equal to the annual contract value of $4.0 million. As of March 31, 2026, the remaining commitment under this customer contract, which expires on December 31, 2026, was approximately $3.9 million. As of March 31, 2026, the amount of performance bonds outstanding as required by other customer supply agreements was $0.3 million. Tinuum Group The Company has certain limited obligations contingent upon future events in connection with the activities of Tinuum Group. The Company, along with certain other owners of Tinuum Group, have provided another Tinuum Group owner with limited guarantees (the "Tinuum Group Party Guarantees") related to certain losses it may suffer as a result of inaccuracies or breach of representations and covenants. The Company also is a party to a contribution agreement under which any party called upon to pay on a Tinuum Group Party Guaranty is entitled to receive contribution from the other party equal to 50% of the amount paid. No liability or expense provision has been recorded by the Company related to this contingent obligation as the Company believes that it is not probable that a loss will occur with respect to Tinuum Group Party Guarantees. Legal Proceedings The Company is from time to time subject to various pending or threatened legal actions and proceedings, including those that arise in the ordinary course of its business. Such matters are subject to many uncertainties and outcomes, the financial impacts of which are not predictable with assurance and that may not be known for extended periods of time. The Company records a liability in its consolidated financial statements for costs related to claims, settlements and judgments where management has assessed that a loss is probable and an amount can be reasonably estimated. On February 7, 2025, the Company announced that it had commenced legal proceedings against the firm engaged for design of the GAC facility constructed at the Red River Plant (the "GAC Facility"). The Company believes that the design firm was, among other things, negligent and breached its contract with the Company and as a direct result, the Company suffered material damages including a material increase in costs and time delays associated with the project versus original forecasts. The Company is now seeking to recover damages resulting from such negligence and contractual breaches. On April 11, 2025, the design firm filed a counterclaim to recover certain fees associated with the services provided.

As the owner of the Five Forks Mine, the Company is required to post a surety bond with a regulatory commission related to performance requirements associated with the Five Forks Mine. As of March 31, 2026, the amount of this surety bond was $7.5 million.

The Company leases land adjacent to the Corbin Facility and is required to post surety bonds with a regulatory commission for reclamation. As of March 31, 2026, the amount of these surety bonds was $3.0 million.

The Company holds permits for an abandoned mine in West Virginia ("Mine 4") and is required to post a surety bond with a regulatory commission for reclamation. As of March 31, 2026, the amount of this surety bond was $0.7 million.

As of March 31, 2026 and December 31, 2025, the Company posted cash collateral of $9.2 million and $8.5 million, respectively, as required by the Company's surety bond providers, which is reported as long-term restricted cash in the Condensed Consolidated Balance Sheets. As of March 31, 2026, the Company holds a deposit of $0.4 million with a third party for collateral as required under a bonding arrangement for Mine 4. This deposit is included in "Other long-term assets, net" in the Condensed Consolidated Balance Sheets as of March 31, 2026.

From time to time, the Company will enter into customer supply agreements which require the Company to obtain performance bonds equal to the annual contract values. The most significant of these was renewed January 1, 2026 and requires the Company to post a performance bond in an amount equal to the annual contract value of $4.0 million. As of March 31, 2026, the remaining commitment under this customer contract, which expires on December 31, 2026, was approximately $3.9 million. As of March 31, 2026, the amount of performance bonds outstanding as required by other customer supply agreements was $0.3 million.

The Company has certain limited obligations contingent upon future events in connection with the activities of Tinuum Group. The Company, along with certain other owners of Tinuum Group, have provided another Tinuum Group owner with limited guarantees (the "Tinuum Group Party Guarantees") related to certain losses it may suffer as a result of inaccuracies or breach of representations and covenants. The Company also is a party to a contribution agreement under which any party called upon to pay on a Tinuum Group Party Guaranty is entitled to receive contribution from the other party equal to 50% of the amount paid. No liability or expense provision has been recorded by the Company related to this contingent obligation as the Company believes that it is not probable that a loss will occur with respect to Tinuum Group Party Guarantees.

The Company is from time to time subject to various pending or threatened legal actions and proceedings, including those that arise in the ordinary course of its business. Such matters are subject to many uncertainties and outcomes, the financial impacts of which are not predictable with assurance and that may not be known for extended periods of time. The Company records a liability in its consolidated financial statements for costs related to claims, settlements and judgments where management has assessed that a loss is probable and an amount can be reasonably estimated.

On February 7, 2025, the Company announced that it had commenced legal proceedings against the firm engaged for design of the GAC facility constructed at the Red River Plant (the "GAC Facility"). The Company believes that the design firm was, among other things, negligent and breached its contract with the Company and as a direct result, the Company suffered material damages including a material increase in costs and time delays associated with the project versus original forecasts. The Company is now seeking to recover damages resulting from such negligence and contractual breaches. On April 11, 2025, the design firm filed a counterclaim to recover certain fees associated with the services provided.