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Merger with Arch (Tables)
 9 Months Ended
Sep. 30, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]  
Schedule of Preliminary Allocation Aggregate Purchase Price
The following table presents the preliminary allocation of the aggregate purchase price based on estimated fair values:
Preliminary Purchase Price Allocation
Total Equity Portion of Purchase Price Consideration$2,481,368 
Effective Settlement of Pre-Existing Relationships95,636 
Total Consideration Transferred$2,577,004 
Assets Acquired:
Cash and Cash Equivalents$217,593 
Short-Term Investments22,969 
Trade Receivables, net161,670 
Other Receivables, net6,629 
Inventories307,175 
Other Current Assets13,366 
Property, Plant and Equipment, net2,604,625 
Funds for Asset Retirement Obligations150,033 
Other Noncurrent Assets, net155,763 
Total Assets Acquired3,639,823 
Liabilities Assumed:
Accounts Payable211,227 
Current Portion of Long-Term Debt4,104 
Other Accrued Liabilities154,651 
Long-Term Debt6,667 
Postretirement Benefits Other Than Pensions37,118 
Pneumoconiosis Benefits111,313 
Asset Retirement Obligations248,773 
Workers’ Compensation36,254 
Salary Retirement786 
Deferred Income Taxes158,471 
Other Noncurrent Liabilities93,455 
Total Liabilities Assumed1,062,819 
Net Assets Acquired$2,577,004 
Schedule of Pro Forma Adjustments
The table below summarizes the Company's results as though the Merger had been consummated on January 1, 2024:
Three Months Ended
September 30, 2024		Nine Months Ended
September 30,
20252024
Revenues (a)
$1,172,016 $3,173,017 $3,499,093 
Net Income (Loss) (a)
$69,680 $(52,109)$125,877 
(a) Pro forma information has not been provided for the three months ended September 30, 2025 since Arch was fully consolidated for the entire period. Pro forma information for the nine months ended September 30, 2025 includes Arch's historical results for the January 1, 2025 through January 13, 2025 period prior to the Merger excluding Merger-related costs.