Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues:
Commissions	$ 598,949		$ 501,434		$ 548,733
Principal transactions	459,968		408,935		346,304
Investment banking	448,060		281,280		185,654
Asset management and service fees	305,639		257,981		228,831
Interest	142,539		108,705		89,199
Other income	64,659		69,148		19,651
Total revenues	2,019,814		1,627,483		1,418,372
Interest expense	46,368		33,370		25,304
Net revenues	1,973,446	[1]	1,594,113	[1]	1,393,068	[1]
Non-interest expenses:
Compensation and benefits	1,311,386		1,010,140		887,210
Occupancy and equipment rental	158,268		128,365		119,944
Communications and office supplies	99,726		79,406		74,037
Commissions and floor brokerage	37,225		29,610		25,423
Other operating expenses	181,612		116,845		148,305
Total non-interest expenses	1,788,217		1,364,366		1,254,919
Income before income tax expense	185,229		229,747		138,149
Provision for income taxes	12,322		84,451		53,880
Income from continuing operations	172,907		145,296		84,269
Income/(loss) from discontinued operations, net of tax	(10,894)		(6,723)		(135)
Net income	$ 162,013				$ 84,134
Earnings per basic common share
Income from continuing operations	$ 2.72		$ 2.71		$ 1.61
Income/(loss) from discontinued operations	$ (0.17)		$ (0.12)
Earnings per basic common share	$ 2.55		$ 2.59		$ 1.61
Earnings per diluted common share
Income from continuing operations	$ 2.35		$ 2.31		$ 1.34
Income/(loss) from discontinued operations	$ (0.15)		$ (0.11)
Earnings per diluted common share	$ 2.20		$ 2.20		$ 1.34
Weighted average number of common shares outstanding:
Basic	63,568		53,563		52,418
Diluted	73,504		62,937		63,058

[1] No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2013, 2012, or 2011.