Fixed Assets and Asset Retirement Obligations (Schedule of Mineral Leaseholds) (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Mineral leaseholds	$ 566,019,000	$ 566,019,000
Less: Accumulated depletion	(30,468,000)	(25,499,000)
Mineral leaseholds, net	$ 535,551,000	$ 540,520,000

Carrying amount at the balance sheet date of mineral properties, gross of adjustments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

Name:	us-gaap_MineralPropertiesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant