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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, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |
Property and leasehold costs | $ 491,660 | $ 488,584
Liabilities for dismantlements | 88,075 | 98,444
Postretirement and other employee benefits | 113,826 | 134,444
Alternative minimum tax | 9,765 | 29,710
Foreign tax credit carryforwards |  | 228,159
U.S. net operating loss | 496,629 | 272,930
Other deferred tax assets | 19,974 | 13,892
Total gross deferred tax assets | 1,219,929 | 1,266,163
Less valuation allowance | (213,815) | (476,256)
Net deferred tax assets | 1,006,114 | 789,907
Deferred tax liabilities |  |
Deferred tax on undistributed foreign earnings | (5,000) | (65,000)
Accumulated depreciation, depletion and amortization | (742,562) | (669,638)
Other deferred tax liabilities | (28,802) | (2,824)
Total gross deferred tax liabilities | (776,364) | (737,462)
Net deferred tax assets | $ 229,750 | $ 52,445

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