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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income tax rate     35.00% 35.00% 35.00%
Increase in income tax expense     $ 2,502    
Decrease in net deferred tax assets $ 2,502   (2,502)    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 408   408 $ 465 $ 1,581
Income tax provision included in expense     106 1,419 110
Income tax provision included in expense, federal benefit     13 667 60
Income tax provision included in expense, penalties and accrued interest 106   106 $ 0 $ 2,086
State and Local Jurisdiction [Member]          
Operating Loss Carryforwards 116,621   116,621    
Operating Loss Carryforwards, Valuation Allowance 80,749   80,749    
U.S. Federal [Member]          
Operating Loss Carryforwards 18,578   18,578    
Tax Credit Carryforwards $ 2,051   $ 2,051    
U.S. Federal [Member] | Earliest Tax Year [Member]          
Income Tax Examination, Year under Examination     2015    
U.S. Federal [Member] | Latest Tax Year [Member]          
Income Tax Examination, Year under Examination     2016    
Minimum [Member] | State and Local Jurisdiction [Member]          
Operating Loss Carryforwards, Expiration Date     Dec. 31, 2020    
Minimum [Member] | U.S. Federal [Member]          
Carryforwards, Expiration Date     Dec. 31, 2030    
Maximum [Member] | State and Local Jurisdiction [Member]          
Operating Loss Carryforwards, Expiration Date     Dec. 31, 2037    
Maximum [Member] | U.S. Federal [Member]          
Carryforwards, Expiration Date     Dec. 31, 2037    
Scenario, Plan [Member]          
Income tax rate   21.00%