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Acquisition (Pro Forma) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition [Line Items]        
Revenues $ 292,164 $ 234,573 $ 516,261 $ 485,957
Net income (loss) attributable to Cowen Inc. 5,812 5,399 15,595 22,252
Quarton        
Business Acquisition [Line Items]        
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed 100   1,100  
Revenues   218,625   454,962
Net income (loss)   $ 3,057   $ 19,888
Basic (usd per share)   $ 0.10   $ 0.65
Diluted (usd per share)   $ 0.10   $ 0.63
Revenues 6,900   12,200  
Net income (loss) attributable to Cowen Inc. $ 800   $ 2,400