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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets The gross and net balances are set forth in the following table:
 Gross Carrying
Amount
Accumulated
Amortization and Impairment
Net
Balance
Balance at December 31, 2025   
Coal supply agreement$84,200 $(79,475)$4,725 
Balance at December 31, 2024   
Coal supply agreement$84,200 $(78,725)$5,475