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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |
Income tax expense (benefit) | $ 0 | $ (71) | $ (8,749)
Income tax expense due to TCJA |  |  | $ 243,800
Minimum |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Number of tax years open for state tax audit (in years) | 3 years |  |
Maximum |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Number of tax years open for state tax audit (in years) | 5 years |  |
Domestic Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Federal net operating loss carryovers | $ 1,400,000 |  |
Operating loss carryforwards, subject to expiration | 800,000 |  |
Operating loss carryforwards, not subject to expiration | 600,000 |  |
Tax credits, not subject to expiration | $ 32,000 |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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