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Income Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Increase (decrease) in valuation allowance before consideration of the Tax Act | $ (5,713) | $ 246,037
Increase (decrease) in valuation allowance before consideration of the Tax Act | 0 | 48,531
Total increase (decrease) in valuation allowance | (5,713) | 294,568
Tax Act rate change - decrease in valuation allowance | 0 | (172,235)
Impact on net operating loss usage | 6,042 | (50,551)
Total increase (decrease) in valuation allowance due to Tax Act | 6,042 | (222,786)
Total increase (decrease) in valuation allowance | $ 329 | $ 71,782

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- References No definition available. + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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