Merger with Arch - Preliminary Allocation Aggregate Purchase Price (Details) - Arch Resources, Inc $ in Thousands	Jan. 14, 2025 USD ($)
Business Combination [Line Items]
Total Equity Portion of Purchase Price Consideration	$ 2,481,368
Effective Settlement of Pre-Existing Relationships	95,636
Total Consideration Transferred	2,577,004
Assets Acquired:
Cash and Cash Equivalents	217,593
Short-Term Investments	22,969
Trade Receivables, net	161,670
Other Receivables, net	6,629
Inventories	307,175
Other Current Assets	13,366
Property, Plant and Equipment, net	2,604,625
Funds for Asset Retirement Obligations	150,033
Other Noncurrent Assets, net	155,763
Total Assets Acquired	3,639,823
Liabilities Assumed:
Accounts Payable	211,227
Current Portion of Long-Term Debt	4,104
Other Accrued Liabilities	154,651
Long-Term Debt	6,667
Postretirement Benefits Other Than Pensions	37,118
Pneumoconiosis Benefits	111,313
Asset Retirement Obligations	248,773
Workers’ Compensation	36,254
Salary Retirement	786
Deferred Income Taxes	158,471
Other Noncurrent Liabilities	93,455
Total Liabilities Assumed	1,062,819
Net Assets Acquired	$ 2,577,004