Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Commissions	$ 429,520	$ 407,857
Principal transactions	84,230	91,918
Fees from related parties	5,795	6,299
Data, software and post-trade	17,910	15,099
Interest income	3,665	2,675
Other revenues	3,631	926
Total revenues	544,751	524,774
Expenses:
Compensation and employee benefits	288,000	277,847
Equity-based compensation and allocations of net income to limited partnership units and FPUs	12,141	39,389
Total compensation and employee benefits	300,141	317,236
Occupancy and equipment	46,002	37,147
Fees to related parties	2,927	4,051
Professional and consulting fees	20,005	17,908
Communications	30,411	31,399
Selling and promotion	18,402	16,225
Commissions and floor brokerage	14,618	13,915
Interest expense	13,198	9,368
Other expenses	24,015	17,338
Total expenses	469,719	464,587
Other income (losses) , net:
Gain (loss) on divestiture and sale of investments	20,054
Gains (losses) on equity method investments	783	2,624
Other income (loss)	21,202	31,411
Total other income (losses), net	42,039	34,035
Income (loss) from operations before income taxes	117,071	94,222
Provision (benefit) for income taxes	29,897	21,550
Consolidated net income (loss) from continuing operations	87,174	72,672
Consolidated net income (loss) from discontinued operations, net of tax		24,759
Consolidated net income (loss)	87,174	97,431
Less: Net income (loss) from continuing operations attributable to noncontrolling interest in subsidiaries	25,306	28,674
Less: Net income (loss) from discontinued operations attributable to noncontrolling interest in subsidiaries		9,983
Net income (loss) available to common stockholders	61,868	58,774
Basic earnings (loss) per share from continuing operations
Net income (loss) from continuing operations available to common stockholders	$ 61,868	$ 43,998
Basic earnings (loss) per share from continuing operations	$ 0.18	$ 0.14
Basic weighted-average shares of common stock outstanding	338,403	307,728
Fully diluted earnings (loss) per share from continuing operations
Net income (loss) from continuing operations for fully diluted shares	$ 90,765	$ 64,771
Fully diluted earnings (loss) per share from continuing operations	$ 0.18	$ 0.14
Fully diluted weighted-average shares of common stock outstanding	516,066	478,935