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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, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Property and leasehold costs | $ 95,141 | $ 233,351
Liabilities for dismantlements | 28,475 | 78,361
Postretirement and other employee benefits | 128,281 | 125,250
Alternative minimum tax | 0 | 9,765
U. S. net operating loss | 589,067 | 495,252
Investment in partnership | 65,216 | 0
Other deferred tax assets | 112,685 | 66,795
Total gross deferred tax assets | 1,018,865 | 1,008,774
Less valuation allowance | (106,448) | (103,113)
Net deferred tax assets | 912,417 | 905,661
Deferred tax liabilities |  |
Deferred tax on undistributed foreign earnings | (5,000) | (5,000)
Accumulated depreciation, depletion and amortization | (665,255) | (938,614)
Deferred Tax Liabilities, Investments | 0 | (14,250)
Other deferred tax liabilities | (27,250) | (25,708)
Total gross deferred tax liabilities | (697,505) | (983,572)
Net deferred tax (liabilities) assets | $ 214,912 |
Net deferred tax (liabilities) assets |  | $ (77,911)

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