Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash Flows from Operating Activities:
Net (Loss) Income	$ (105,833)	$ 159,952
Adjustments to Reconcile Net (Loss) Income to Net Cash Provided by Operating Activities:
Depreciation, Depletion and Amortization	290,819	111,844
Gain on Sale of Assets	(5,968)	(6,784)
Stock-Based Compensation	32,027	7,355
Loss on Debt Extinguishment	11,680	0
Deferred Income Taxes	3,137	180
Loss from Equity Method Investments	8,034	534
Other Adjustments to Net (Loss) Income	1,915	(177)
Changes in Operating Assets:
Accounts and Notes Receivable	(4,254)	809
Inventories	26,323	(9,353)
Other Current Assets	(18,360)	3,321
Changes in Other Assets	22,654	(2,070)
Changes in Operating Liabilities:
Accounts Payable	(78,411)	426
Other Operating Liabilities	(25,631)	(37,801)
Payments on Asset Retirement Obligations	(14,808)	(11,926)
Changes in Other Liabilities	(32,801)	(22,562)
Net Cash Provided by Operating Activities	110,523	193,748
Cash Flows from Investing Activities:
Capital Expenditures	(154,007)	(97,760)
Proceeds from Sales of Assets	6,219	6,948
Proceeds from Sales of Short-Term Investments	80,165	20,543
Purchases of Short-Term Investments	(4,802)	(20,084)
Net Cash and Restricted Cash Acquired from Merger	368,726	0
Purchase of Arch Tax-Exempt Bonds	98,225	0
Investments in DTA	(10,640)	0
Other Investing Activity	(4,647)	(5,148)
Net Cash Provided by (Used in) Investing Activities	182,789	(95,501)
Cash Flows from Financing Activities:
Payments on Finance Lease Obligations	(5,628)	(6,424)
Proceeds from Long-Term Debt	114,439	0
Payments on Other Debt	(11,223)	(710)
Shares Withheld for Taxes	(14,068)	(5,578)
Repurchases of Common Stock	(183,152)	(70,879)
Debt-Related Financing Fees	(17,470)	0
Payments of Excise Tax on Share Repurchases	(934)	0
Dividends and Dividend Equivalents Paid	(15,918)	(1,098)
Net Cash Used in Financing Activities	(133,954)	(84,689)
Net Increase in Cash and Cash Equivalents and Restricted Cash	159,358	13,558
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	606,900	256,826
Non-Cash Investing and Financing Activities:
Equipment Financing	66,147	364
Equity Issued as Consideration for Merger	$ 2,481,368	$ 0