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Income Taxes - Schedule of Analysis of Deferred Tax Assets and Deferred Tax Liabilities Showing Tax Effects of Significant Temporary Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Deferred tax assets |  |
Property and leasehold costs | $ 225,379 | $ 240,065
Liabilities for dismantlements | 36,719 | 34,258
Postretirement and other employee benefits | 66,293 | 82,437
U. S. net operating loss | 289,594 | 357,490
Investment in partnership | 9,096 | 14,655
Other deferred tax assets | 100,352 | 48,778
Total gross deferred tax assets | 727,433 | 777,683
Less: Valuation allowance | (149,498) | (146,861)
Net deferred tax assets | 577,935 | 630,822
Deferred tax liabilities |  |
Deferred tax on undistributed foreign earnings | (5,000) | (5,000)
Accumulated depreciation, depletion and amortization | (811,178) | (847,981)
Other deferred tax liabilities | (97,547) | (54,052)
Total gross deferred tax liabilities | (913,725) | (907,033)
Net deferred tax (liabilities) assets | $ (335,790) | $ (276,211)

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