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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, 2022 | Dec. 31, 2021
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Deferred tax assets |  |
Property and leasehold costs | $ 242,467 | $ 241,833
Liabilities for dismantlements | 31,017 | 37,728
Postretirement and other employee benefits | 86,798 | 114,790
U. S. net operating loss | 442,699 | 577,531
Investment in partnership | 11,595 | 39,396
Other deferred tax assets | 111,212 | 135,838
Total gross deferred tax assets | 925,788 | 1,147,116
Less valuation allowance | (136,008) | (111,259)
Net deferred tax assets | 789,780 | 1,035,857
Deferred tax liabilities |  |
Deferred tax on undistributed foreign earnings | (5,000) | (5,000)
Accumulated depreciation, depletion and amortization | (796,510) | (786,846)
Other deferred tax liabilities | (85,284) | (41,387)
Total gross deferred tax liabilities | (886,794) | (833,233)
Net deferred tax (liabilities) assets | $ (97,014) |
Net deferred tax (liabilities) assets |  | $ 202,624

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