Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash Flows from Operating Activities:
Net (Loss) Income	$ (69,277)	$ 101,891
Adjustments to Reconcile Net (Loss) Income to Net Cash (Used in) Provided by Operating Activities:
Depreciation, Depletion and Amortization	121,556	56,997
Gain on Sale of Assets	(5,817)	(6,077)
Stock-Based Compensation	36,094	5,118
Amortization of Debt Issuance Costs	1,175	937
Loss on Debt Extinguishment	11,680	0
Deferred Income Taxes	(4,193)	74
Other Adjustments to Net (Loss) Income	1,876	(776)
Changes in Operating Assets:
Accounts and Notes Receivable	(94,369)	(19,618)
Inventories	15,382	(21,336)
Other Current Assets	(21,998)	2,414
Changes in Other Assets	21,774	(1,382)
Changes in Operating Liabilities:
Accounts Payable	(54,048)	3,180
Other Operating Liabilities	(35,227)	(26,065)
Payments on Asset Retirement Obligations	(6,182)	(5,806)
Changes in Other Liabilities	(28,064)	(12,067)
Net Cash (Used in) Provided by Operating Activities	(109,638)	77,484
Cash Flows from Investing Activities:
Capital Expenditures	(64,822)	(42,352)
Proceeds from Sales of Assets	6,003	6,191
Proceeds from Sales of Short-Term Investments	80,165	15,543
Purchases of Short-Term Investments	(4,802)	(15,331)
Net Cash and Restricted Cash Acquired from Merger	368,726	0
Purchase of Arch Tax-Exempt Bonds	(98,225)	0
Other Investing Activity	(4,034)	(348)
Net Cash Provided by (Used in) Investing Activities	283,011	(36,297)
Cash Flows from Financing Activities:
Payments on Finance Lease Obligations	(2,795)	(3,410)
Proceeds from Long-Term Debt	114,439	0
Payments on Other Debt	(10,831)	(253)
Shares Withheld for Taxes	(14,068)	(5,551)
Repurchases of Common Stock	(101,259)	(57,881)
Debt-Related Financing Fees	(16,381)	0
Dividends and Dividend Equivalents Paid	(10,695)	(582)
Net Cash Used in Financing Activities	(41,590)	(67,677)
Net Increase (Decrease) in Cash and Cash Equivalents and Restricted Cash	131,783	(26,490)
Cash and Cash Equivalents and Restricted Cash at Beginning of Period	447,542	243,268
Cash and Cash Equivalents and Restricted Cash at End of Period	579,325	216,778
Non-Cash Investing and Financing Activities:
Equipment Financing	39,150	0
Equity Issued as Consideration for Merger	$ 2,577,004	$ 0