Annual report pursuant to Section 13 and 15(d)

Income Taxes Provisional Amounts Disclosures Related to Tax Cuts and Jobs Act (Details)

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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes, Provisional Items [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 5,727 $ 51,177 $ 6,661
Domestic Tax Authority [Member]      
Income Taxes, Provisional Items [Line Items]      
Federal Alternative Minimum Tax Credit Carryforward 700    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 11,300 $ 51,200  
Maximum [Member]      
Income Taxes, Provisional Items [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%    
Minimum [Member]      
Income Taxes, Provisional Items [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%