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Acquisition (Pro Forma) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Revenues $ 252,047 $ 221,028 $ 768,308 $ 706,985
Net income (loss) attributable to Cowen Inc. 3,813 15,488 19,408 37,740
Quarton        
Business Acquisition [Line Items]        
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed 100   1,200  
Net revenues   206,797   661,759
Net income (loss)   $ 15,728   $ 35,616
Basic (usd per share)   $ 0.51   $ 1.16
Diluted (usd per share)   $ 0.49   $ 1.12
Revenues 14,100   26,300  
Net income (loss) attributable to Cowen Inc. $ 3,200   $ 5,600