Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Commissions		$ 162,612	$ 171,272	$ 510,150	$ 551,306
Principal transactions		87,010	117,002	299,570	364,376
Investment banking		181,904	144,799	494,017	378,582
Asset management and service fees		179,848	144,206	515,501	433,305
Interest		117,862	74,881	327,766	203,488
Other income		9,558	9,209	25,508	33,804
Total revenues		738,794	661,369	2,172,512	1,964,861
Interest expense		17,625	19,383	50,165	50,756
Net revenues	[1]	721,169	641,986	2,122,347	1,914,105
Non-interest expenses:
Compensation and benefits		448,410	434,236	1,338,673	1,305,372
Occupancy and equipment rental		57,427	62,453	167,864	178,455
Communications and office supplies		34,650	31,182	102,686	105,268
Commissions and floor brokerage		11,232	10,777	33,187	34,653
Other operating expenses		61,311	75,356	209,581	202,669
Total non-interest expenses		613,030	614,004	1,851,991	1,826,417
Income from operations before income tax expense		108,139	27,982	270,356	87,688
Provision for income taxes		41,603	10,168	85,497	33,048
Net income		66,536	17,814	184,859	54,640
Preferred dividends		2,343	1,563	7,031	1,563
Net income available to common shareholders		$ 64,193	$ 16,251	$ 177,828	$ 53,077
Earnings per common share:
Basic		$ 0.94	$ 0.24	$ 2.60	$ 0.79
Diluted		$ 0.79	$ 0.21	$ 2.21	$ 0.69
Weighted-average number of common shares outstanding:
Basic		68,522	66,482	68,488	66,950
Diluted		80,881	77,544	80,562	76,612

[1] No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2017 or 2016.