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Income Taxes Provisional Amounts Disclosures Related to Tax Cuts and Jobs Act (Details) - USD ($)
$ in Thousands
 12 Months Ended
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