Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Revenues:
Commissions		$ 197,930	$ 180,302
Principal transactions		120,948	100,205
Investment banking		100,658	125,089
Asset management and service fees		144,532	113,869
Interest		62,786	42,736
Other income		7,231	11,800
Total revenues		634,085	574,001
Interest expense		14,111	13,019
Net revenues	[1]	619,974	560,982
Non-interest expenses:
Compensation and benefits		411,113	355,693
Occupancy and equipment rental		57,255	44,170
Communications and office supplies		36,660	29,234
Commissions and floor brokerage		11,732	10,069
Other operating expenses		59,301	51,750
Total non-interest expenses		576,061	490,916
Income from operations before income tax expense		43,913	70,066
Provision for income taxes		16,858	26,969
Net income		$ 27,055	$ 43,097
Earnings per common share:
Basic		$ 0.40	$ 0.62
Diluted		$ 0.36	$ 0.56
Weighted-average number of common shares outstanding:
Basic		67,579	68,006
Diluted		76,086	77,359

[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2016 or 2015.