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Income Taxes (Effective Income Tax Rates) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |  |  |  |
Income tax expense (benefit) based on the U.S. statutory tax rate | $ 25,131 | $ (172,590) |  | $ (1,148,792) |
Revaluation of deferred tax (U.S. tax reform) | 118,004 |  |  |  |
Deferred tax effect of deemed repatriation of foreign invested earnings (U.S. tax reform) | 156,000 |  |  |  |
Deferred tax effect on Canadian earnings no longer indefinitely invested | 65,000 |  |  |  |
Foreign income (loss) subject to foreign tax rates different than the U.S. statutory rate | 12,658 | 8,582 |  | 49,739 |
State income taxes, net of federal benefit | 2,438 | 9,090 |  | (3,441) |
U.S. tax benefit on certain foreign upstream investments | (32,926) | (21,336) |  | (16,939) |
Deferred tax on distribution of foreign earnings |  |  |  | 188,461 |
Increase in deferred tax asset valuation allowance related to other foreign exploration expenditures | 18,601 | 25,734 |  | 40,788 |
Other, net | 17,832 | 18,741 |  | (13,747) |
Total income tax expense (benefit) | $ 382,738 | (219,172) | [1] | (1,026,490) | [1]
Canada [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Tax effects on sale of assets |  | (89,473) |  |  |
Malaysia [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Tax effects on sale of assets |  | $ 2,080 |  | $ (122,559) |
[1] | Reclassified to conform to current presentation (see Note A).

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