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Income Taxes - Effective Income Tax Rates (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Income tax expense (benefit) based on the U.S. statutory tax rate | $ (325,299) | $ 42,735 | $ 9,031
Alberta tax rate reduction and tax impact of deemed repatriation of foreign invested earnings (U.S. tax reform) | 0 | (17,019) | (135,700)
Foreign income (loss) subject to foreign tax rates different than the U.S.statutory rate | (3,791) | (1,122) | 5,822
State income taxes, net of federal benefit | (6,646) | 4,060 | 2,607
U.S. tax benefit on certain foreign upstream investments | 0 | (14,975) | (14,702)
Increase in deferred tax asset valuation allowance related to other foreign exploration expenditures | 7,707 | 10,927 | 3,283
Tax effect on income attributable to noncontrolling interest | 23,712 | (21,750) | (1,753)
Other, net | 10,576 | 11,827 | 5,276
Total income tax expense (benefit) | $ (293,741) | $ 14,683 | $ (126,136)

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