Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019		Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Investment banking	$ 114,705,000		$ 84,826,000	$ 194,811,000	$ 182,814,000
Brokerage	111,382,000		103,285,000	208,845,000	209,018,000
Management fees	7,039,000		7,373,000	14,180,000	14,790,000
Incentive income	8,000		48,000	23,000	64,000
Interest and dividends	40,047,000		25,109,000	69,139,000	51,063,000
Reimbursement from affiliates	254,000		336,000	542,000	713,000
Aircraft lease revenue	0		419,000	0	1,134,000
Reinsurance premiums	14,331,000		9,226,000	20,922,000	17,873,000
Other revenues	930,000		876,000	1,991,000	2,212,000
Consolidated Funds
Interest and dividends	3,449,000		3,075,000	5,774,000	6,271,000
Other revenues	19,000		0	34,000	5,000
Total revenues	292,164,000		234,573,000	516,261,000	485,957,000
Interest and dividends expense	39,528,000		24,306,000	68,612,000	48,846,000
Total net revenues	252,636,000		210,267,000	447,649,000	437,111,000
Expenses
Employee compensation and benefits	135,984,000		131,845,000	266,172,000	266,985,000
Brokerage and trade execution costs	27,124,000		28,902,000	52,770,000	59,100,000
Underwriting expenses	6,406,000		4,785,000	9,537,000	8,848,000
Professional, advisory and other fees	13,620,000		5,819,000	23,861,000	12,843,000
Service fees	5,659,000		4,852,000	11,323,000	10,047,000
Communications	8,278,000		7,106,000	16,359,000	14,672,000
Occupancy and equipment	10,454,000		10,384,000	20,376,000	20,245,000
Depreciation and amortization	4,952,000		3,194,000	9,908,000	6,419,000
Client services and business development	11,884,000		7,865,000	23,185,000	16,096,000
Goodwill, Impairment Loss	4,100,000	[1],[2],[3],[4]	0	4,100,000	0
Reinsurance claims, commissions and amortization of deferred acquisition costs	10,782,000		9,924,000	16,944,000	18,655,000
Other expenses	5,638,000		5,591,000	9,653,000	9,672,000
Consolidated Funds
Interest and dividends	1,356,000		2,479,000	2,223,000	4,390,000
Professional, advisory and other fees	373,000		345,000	518,000	557,000
Floor brokerage and trade execution	35,000		89,000	88,000	153,000
Other expenses	467,000		236,000	884,000	480,000
Total expenses	247,112,000		223,416,000	467,901,000	449,162,000
Other income (loss)
Net gains (losses) on securities, derivatives and other investments	3,910,000		16,719,000	42,994,000	32,688,000
Gain (loss) on debt extinguishment	0		(556,000)	0	(556,000)
Consolidated Funds
Net realized and unrealized gains (losses) on investments and other transactions	6,536,000		28,268,000	9,180,000	44,004,000
Net realized and unrealized gains (losses) on derivatives	(719,000)		2,119,000	(1,481,000)	4,594,000
Net gains (losses) on foreign currency transactions	(35,000)		598,000	(59,000)	252,000
Total other income (loss)	9,692,000		47,148,000	50,634,000	80,982,000
Income (loss) before income taxes	15,216,000		33,999,000	30,382,000	68,931,000
Income tax expense (benefit)	5,073,000		3,993,000	8,250,000	10,916,000
Net income (loss)	10,143,000		30,006,000	22,132,000	58,015,000
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries and investment funds	(4,331,000)		(24,607,000)	(6,537,000)	(35,763,000)
Net income (loss) attributable to Cowen Inc.	5,812,000		5,399,000	15,595,000	22,252,000
Preferred stock dividends	1,698,000		1,698,000	3,396,000	3,396,000
Net income (loss) attributable to Cowen Inc. common stockholders	$ 4,114,000		$ 3,701,000	$ 12,199,000	$ 18,856,000
Weighted average common shares outstanding:
Basic (in shares)	29,769		29,769	29,766	29,688
Diluted (in shares)	31,522		30,720	31,572	30,460
Earnings (loss) per share:
Earnings Per Share, Basic (in dollars per share)	$ 0.14		$ 0.12	$ 0.41	$ 0.64
Earnings Per Share, Diluted (in dollars per share)	$ 0.13		$ 0.12	$ 0.39	$ 0.62

[1] Economic Income (Loss) excludes income taxes and acquisition related adjustments as management does not consider these items when evaluating the performance of the segment.

[2] Economic Income (Loss) presents underwriting expenses net of investment banking revenues, expenses reimbursedfrom clients within their respective expense category. Economic Income (Loss) also records retainer fees, relating to investment banking activities, collectible during the period that would otherwise be deferred until closing for US GAAP reporting

[3] Economic Income (Loss) recognizes Company income from proprietary trading (including interest and dividends

[4] Economic Income (Loss) recognizes the Company's proportionate share of expenses, for certain real estate operating entities and the activist business, for which the investments are recorded under the equity method of accounting for investments.