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Income Taxes - Analysis of Deferred Tax Assets and Deferred Tax Liabilities Showing Tax Effects of Significant Temporary Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Deferred tax assets |  |
Property and leasehold costs | $ 240,065 | $ 242,467
Liabilities for dismantlements | 34,258 | 31,017
Postretirement and other employee benefits | 82,437 | 86,798
U. S. net operating loss | 357,490 | 442,699
Investment in partnership | 14,655 | 11,595
Other deferred tax assets | 48,778 | 111,212
Total gross deferred tax assets | 777,683 | 925,788
Less valuation allowance | (146,861) | (136,008)
Net deferred tax assets | 630,822 | 789,780
Deferred tax liabilities |  |
Deferred tax on undistributed foreign earnings | (5,000) | (5,000)
Accumulated depreciation, depletion and amortization | (847,981) | (796,510)
Other deferred tax liabilities | (54,052) | (85,284)
Total gross deferred tax liabilities | (907,033) | (886,794)
Net deferred tax (liabilities) assets | $ (276,211) | $ (97,014)

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