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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, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets |  |
Property and leasehold costs | $ 488,584 | $ 572,481
Liabilities for dismantlements | 98,444 | 170,946
Postretirement and other employee benefits | 134,444 | 214,288
Alternative minimum tax | 29,710 | 29,710
Foreign tax credit carryforwards | 228,159 | 33,295
U.S. net operating loss | 272,930 | 454,231
Other deferred tax assets | 13,892 | 16,541
Total gross deferred tax assets | 1,266,163 | 1,491,492
Less valuation allowance | (476,256) | (305,389)
Net deferred tax assets | 789,907 | 1,186,103
Deferred tax liabilities |  |
Deferred tax on undistributed foreign earnings | (65,000) |
Accumulated depreciation, depletion and amortization | (669,638) | (867,343)
Other deferred tax liabilities | (2,824) | (21,908)
Total gross deferred tax liabilities | (737,462) | (889,251)
Net deferred tax assets | $ 52,445 | $ 296,852

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