Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Depreciation and Depletion Expense) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Fixed Assets And Asset Retirement Obligations [Abstract]
Depreciation expense	$ 53,347,000	$ 48,715,000	$ 106,947,000	$ 95,647,000
Asset Retirement Obligations Details [Line Items]
Asset retirement obligation balance	258,679,000		258,679,000		$ 254,054,000
Accrued Liabilities
Asset Retirement Obligations Details [Line Items]
Asset retirement obligation balance	$ 25,800,000		$ 25,800,000		$ 25,800,000