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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 28, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]          
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration   $ 7,200      
Unrecognized tax benefits   691 $ 0 $ 0 $ 0
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration   45,800      
Gross increases - tax positions in prior period   $ 691 $ 0 $ 0  
Fairfax, Virginia [Member]          
Operating Loss Carryforwards [Line Items]          
Consideration transferred $ 102,000