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Income Taxes - Effective Income Tax Rates (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense (benefit) based on the U.S. statutory tax rate | $ 42,735 | $ 9,031 |  | $ (98,868) |
Revaluation of deferred tax (U.S. tax reform) | 0 | 0 |  | 118,004 |
Alberta tax rate reduction and tax impact of deemed repatriation of foreign invested earnings (U.S. tax reform) | (17,019) | (135,700) |  | 156,000 |
Deferred tax effect on Canadian earnings no longer indefinitely invested | 0 | 0 |  | 65,000 |
Foreign income (loss) subject to foreign tax rates different than the U.S.statutory rate | (1,122) | 5,822 |  | 2,032 |
State income taxes, net of federal benefit | 4,060 | 2,607 |  | 2,438 |
U.S. tax benefit on certain foreign upstream investments | (14,975) | (14,702) |  | (32,926) |
Increase in deferred tax asset valuation allowance related to other foreign exploration expenditures | 10,927 | 3,283 |  | 18,601 |
Tax effect on income attributable to noncontrolling interest | (21,750) | (1,753) |  | 0 |
Other, net | 11,827 | 5,276 |  | 39,850 |
Total income tax expense (benefit) | $ 14,683 | $ (126,136) | [1] | $ 270,131 | [1]
[1] | 1 Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.

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