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Business Acquisitions - Schedule of Discontinued Operations for Post Acquisition Period (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]                
Net revenues   $ 413            
Total expenses [1]   (996)            
Income before income taxes   1,409            
Income tax expense (benefit)   0            
Income from discontinued operations $ 1,409 $ 1,409 $ 0 $ 0 $ 0 $ 1,409 $ 0 $ 0
[1] Total expenses are shown net of a severance expense reversal that occurred as a result of voluntary post-acquisition employee departures and amortization of facility exit costs.