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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income tax rate 21.00% 21.00%
Operating Loss Carryforwards, Expiration Date Dec. 31, 2030  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 0 $ 0
Income tax provision included in expense 0 94
Income tax provision included in expense, federal benefit 0 11
Income tax provision included in expense, penalties and accrued interest 0 $ 200
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards 160,489  
U.S. Federal [Member]    
Operating Loss Carryforwards 100,431  
Tax Credit Carryforwards $ 2,016  
Minimum [Member] | State and Local Jurisdiction [Member]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2020  
Maximum [Member] | State and Local Jurisdiction [Member]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2039