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Acquisition (Pro Forma) (Details) - Convergex Group [Member]
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenues | $ $ 162,773
Net income (loss) | $ $ (7,899)
Basic (usd per share) | $ / shares $ (0.26)
Diluted (usd per share) | $ / shares $ (0.26)