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Income Taxes Income Taxes (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Income Tax Disclosure [Abstract]    
Tax Cuts and Jobs Act, change in tax rate, income tax expense (benefit)   $ (18,400)
Net operating loss carryforward $ 10,700 10,700
Income Tax Contingency [Line Items]    
Additions to tax positions of prior years 547 547
Income tax penalties and interest accrued $ 55 55
Tax Year 2017    
Income Tax Contingency [Line Items]    
Additions to tax positions of prior years   168
Tax Year 2016    
Income Tax Contingency [Line Items]    
Additions to tax positions of prior years   149
Tax Year 2015    
Income Tax Contingency [Line Items]    
Additions to tax positions of prior years   $ 230