v3.26.3
Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Cash Flows from Operating Activities:    
Net Income (Loss) $ 156,509 $ (74,235)
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities:    
Depreciation, Depletion and Amortization 472,359 441,825
Gain on Sale of Assets (6,116) (6,159)
Stock-Based Compensation 11,039 35,943
Loss on Debt Extinguishment 0 11,680
Deferred Income Taxes 4,272 (49,650)
Loss from Equity Method Investments 11,933 12,841
Other Adjustments to Net Income (Loss) 4,335 3,294
Changes in Operating Assets:    
Accounts and Notes Receivable (60,907) (35,767)
Inventories 11,788 (4,091)
Other Current Assets 5,154 (24,360)
Changes in Other Assets 5,322 26,768
Changes in Operating Liabilities:    
Accounts Payable (18,601) (63,460)
Other Operating Liabilities 15,601 (14,058)
Payments on Asset Retirement Obligations (30,596) (25,094)
Changes in Other Liabilities (37,688) (37,035)
Net Cash Provided by Operating Activities 544,404 198,442
Cash Flows from Investing Activities:    
Capital Expenditures (269,444) (203,304)
Proceeds from Sales of Assets 9,599 6,514
Proceeds from Sales of Short-Term Investments 1,157 80,165
Purchases of Short-Term Investments (16,899) (4,802)
Net Cash and Restricted Cash Acquired from Merger 0 368,726
Purchase of Arch Tax-Exempt Bonds 0 (98,225)
Investments in DTA (16,521) (10,640)
Other Investing Activity (13,089) (6,834)
Net Cash (Used in) Provided by Investing Activities (305,197) 131,600
Cash Flows from Financing Activities:    
Payments on Finance Lease Obligations (26,649) (8,910)
Proceeds from Long-Term Debt Issuance 0 114,439
Payments on Other Debt (3,831) (12,412)
Shares Withheld for Taxes (1,678) (14,068)
Repurchases of Common Stock (189,594) (202,591)
Debt-Related Financing Fees 0 (20,477)
Payments of Excise Tax on Share Repurchases (1,977) (934)
Dividends and Dividend Equivalents Paid (15,065) (21,050)
Net Cash Used in Financing Activities (238,794) (166,003)
Net Increase in Cash, Cash Equivalents and Restricted Cash 413 164,039
Cash, Cash Equivalents and Restricted Cash at Beginning of Period 601,162 447,542
Cash, Cash Equivalents and Restricted Cash at End of Period 601,575 611,581
Non-Cash Investing and Financing Activities:    
Equipment Financing 32,482 91,638
Equity Issued as Consideration for Merger $ 0 $ 2,481,368