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Fixed Assets and Asset Retirement Obligations (Schedule of Mineral Leaseholds) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Property, Plant and Equipment [Abstract] |  |
Mineral leaseholds | $ 566,019 | $ 566,019
Less: Accumulated depletion | (25,499) | (20,897)
Mineral leaseholds, net | $ 540,520 | $ 545,122

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- Definition Carrying amount at the balance sheet date of mineral properties, gross of adjustments. + References 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section 25 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482479/932-360-25-7 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-4 + Details
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