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Income Taxes Provisional Amounts Disclosures Related to Tax Cuts and Jobs Act (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes, Provisional Items [Line Items] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 1,239 | $ 5,727 | $ 51,177
Domestic Tax Authority [Member] |  |  |
Income Taxes, Provisional Items [Line Items] |  |  |
Federal Alternative Minimum Tax Credit Carryforward | $ 300 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 11,300 | $ 51,200

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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=116821951&loc=d3e32123-109318 + Details
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