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Acquisition (Pro Forma) (Details) - Convergex Group
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenues | $ $ 529,294
Net income (loss) | $ $ (7,001)
Basic (usd per share) | $ / shares $ (0.23)
Diluted (usd per share) | $ / shares $ (0.23)