Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Commissions		$ 194,083	$ 167,601	$ 562,249	$ 510,070
Principal transactions		95,593	94,828	281,794	318,312
Investment banking		118,753	118,717	400,302	390,848
Asset management and service fees		130,636	96,638	364,442	280,039
Interest		43,376	52,096	129,964	141,035
Other income		18,930	4,803	44,471	18,745
Total revenues		601,371	534,683	1,783,222	1,659,049
Interest expense		9,796	11,228	32,914	28,701
Net revenues	[1]	591,575	523,455	1,750,308	1,630,348
Non-interest expenses:
Compensation and benefits		404,205	331,440	1,169,896	1,033,478
Occupancy and equipment rental		53,282	41,611	145,798	125,110
Communications and office supplies		35,678	27,464	96,026	78,151
Commissions and floor brokerage		12,430	9,971	31,623	28,247
Other operating expenses		63,632	47,203	176,480	143,945
Total non-interest expenses		569,227	457,689	1,619,823	1,408,931
Income from continuing operations before income tax expense		22,348	65,766	130,485	221,417
Provision for income taxes		5,169	25,673	49,321	87,774
Income from continuing operations		17,179	40,093	81,164	133,643
Discontinued operations:
Loss from discontinued operations, net of tax			(190)		(2,757)
Net income		$ 17,179	$ 39,903	$ 81,164	$ 130,886
Earnings per basic common share
Income from continuing operations		$ 0.25	$ 0.60	$ 1.18	$ 2.01
Income from discontinued operations					(0.04)
Earnings per basic common share		0.25	0.60	1.18	1.97
Earnings per diluted common share
Income from continuing operations		0.22	0.52	1.04	1.76
Income from discontinued operations					(0.04)
Earnings per diluted common share		$ 0.22	$ 0.52	$ 1.04	$ 1.72
Weighted-average number of common shares outstanding:
Basic		69,633	66,691	68,675	66,344
Diluted		79,759	76,681	78,326	76,011

[1] No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2015 or 2014.