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Income Taxes - Schedule of Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Tax Credit Carryforward [Line Items] |  |
Deferred tax assets after valuation allowance | $ 254,624 | $ 353,215
Federal loss carryforwards | 49,821 | 62,010
State loss carryforwards | 7,225 | $ 19,801
Expiring 2028-2033 |  |
Tax Credit Carryforward [Line Items] |  |
Federal loss carryforwards | 49,821 |
Expiring 2019-2023 |  |
Tax Credit Carryforward [Line Items] |  |
State loss carryforwards | 166 |
Expiring 2024-2035 |  |
Tax Credit Carryforward [Line Items] |  |
State loss carryforwards | 7,059 |
Domestic Tax Authority |  |
Tax Credit Carryforward [Line Items] |  |
Deferred tax assets after valuation allowance | 49,800 |
State and Local Jurisdiction |  |
Tax Credit Carryforward [Line Items] |  |
Deferred tax assets after valuation allowance | $ 7,200 |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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