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Income Taxes (Effective Income Tax Rates) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Line Items] |  |  |
Income tax expense (benefit) based on the U.S. statutory tax rate | $ 90,791 | $ 25,131 | $ (172,590)
Revaluation of deferred tax (U.S. tax reform) |  | 118,004 |
Tax impact of deemed repatriation of foreign ivnested earnings (U.S. tax reform) | (135,700) | 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 | 72,007 | 12,658 | 8,582
State income taxes, net of federal benefit | 2,607 | 2,438 | 9,090
U.S. tax benefit on certain foreign upstream investments | (14,702) | (32,926) | (21,336)
Increase in deferred tax asset valuation allowance related to other foreign exploration expenditures | 3,283 | 18,601 | 25,734
Other, net | $ (8,956) | $ 17,832 | 18,741
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

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to disposition of asset. Includes, but is not limited to, intra-entity transfer of asset other than inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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