Acquisition (Tables)

9 Months Ended

Sep. 30, 2015

Acquisition [Abstract]

Business Acquisition, Pro Forma Information

The following unaudited supplemental pro forma information presents condensed consolidated financial results for the nine month periods as if the acquisition was completed as of January 1, 2014. This supplemental pro forma information has been prepared for comparative purposes only and is not intended to be indicative of what the Company's results would have been had the acquisition been completed on January 1, 2014, nor does it purport to be indicative of any future results.

	For the nine months ended September, 30
	2015		2014
	(dollars in thousands, except per share data)
	(unaudited)
Revenues	$	375,651	$	328,677
Net income (loss) attributable to Cowen Group, Inc. common stockholders	12,952		24,840
Net income per common share:
Basic	$	0.12	$	0.21
Diluted	$	0.11	$	0.21