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Discontinued Operations - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income tax expense $ 3,428   $ 2,816
Discontinued Operations, Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash provided by (used in) operating activities for discontinued operations 5,700    
Cash provided by (used in) investing activities for discontinued operations $ (100)    
Discontinued Operations, Disposed of by Sale | Kforce Government Solutions, Inc.("KGS")      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Increase in deferred tax assets     $ 18,500
Discontinued Operation, Tax Effect of Discontinued Operation   $ 18,500