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Assets Held For Sale and Discontinued Operations - Summary of Pretax Profit (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income from discontinued operations, net of tax $ 18,881 $ 1,190
Discontinued Operations, Held-for-sale | GS segment    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenue 26,426 28,852
Direct costs 19,015 21,201
Gross profit 7,411 7,651
Selling, general and administrative expenses 5,432 5,810
Depreciation and amortization 235 242
Income from discontinued operations 1,744 1,599
Other expense (income), net 864 (4)
Income from discontinued operations, before income taxes 880 1,603
Income tax (benefit) expense (18,001) 413
Income from discontinued operations, net of tax $ 18,881 $ 1,190