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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 |  |  |  |

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