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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 10,889 | $ 89,471 | $ 0
State |  |  |  |  |  |  |  |  | 589 | 3,103 | 424
Foreign |  |  |  |  |  |  |  |  | 23 | (66) | (158)
Total Current Income Tax Benefit |  |  |  |  |  |  |  |  | 11,501 | 92,508 | 266
Deferred expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (15,672) | 74,627 | 29,928
State |  |  |  |  |  |  |  |  | (3,382) | 202 | (185)
Income tax expense from continuing operations | $ (2,391) | $ (4,911) | $ 6,033 | $ (6,284) | $ (810) | $ (4,620) | $ (3,609) | $ 176,376 | $ (7,553) | $ 167,337 | $ 30,009

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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