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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |
Statutory income tax rate | 21.00% | 35.00% | 35.00%
Tax depreciation benefit | $ 57,900 |  |
Income tax provision on operating loss carryforwards adjustment | 6,000 |  |
Income tax adjustment | 300 |  |
Rate change - decrease in valuation allowance | 336,417 | $ 336,087 |
Change in valuation allowance | 329 | 71,782 |
Increase (decrease) in valuation allowance before consideration of the Tax Act | 0 | 48,531 |
Gross unrecognized tax benefits | 18,500 | 18,500 |
Penalties and interest accrued | 100 | 100 |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance adjustment | 6,000 |  |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 1,200,000 | 1,200,000 |
Operating loss carryforwards, indefinite lived | 33,500 |  |
Tax credit valuation allowance | 207 |  | $ 13,931
Federal and state |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards valuation allowance | 245,300 | 286,600 |
Tax credit valuation allowance | 49,800 | 49,500 |
Change in valuation allowance | (5,919) | $ 294,568 | $ 128,931
Capital loss carryforward | Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | 165,000 |  |
Capital loss carryforward | Federal and state |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit valuation allowance | $ 41,400 |  |

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- Definition The sum of the differences between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in all income tax contingencies, whether recorded or adjusted, during the period. + References No definition available. + Details
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- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Alternative Depreciation System, Provisional Income Tax Expense (Benefit) + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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