Condensed Consolidated Statements of Financial Condition (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 247,471	$ 317,010
Cash restricted or segregated under regulations and other	68,181	68,965
Deposits with clearing organizations	40,299	14,235
Securities owned, at fair value	5,890	25,789
Receivables from brokers, dealers and clearing organizations	1,073,994	865,251
Receivables from customers	827,134	606,256
Premises and equipment, net	36,805	34,790
Capitalized software, net	60,129	62,507
Goodwill	274,284	468,479
Other intangibles, net	40,720	36,784
Income taxes receivable	6,148	5,561
Deferred taxes	13,207	4,902
Other assets	23,064	20,324
Total assets	2,717,326	2,530,853
Liabilities:
Accounts payable and accrued expenses	179,999	195,109
Short-term bank loans	63,794
Payables to brokers, dealers and clearing organizations	1,119,645	1,139,958
Payables to customers	635,460	272,027
Securities sold, not yet purchased, at fair value	1,395	19,362
Income taxes payable	11,690	16,215
Deferred taxes	343	18,114
Term debt	25,787
Total liabilities	2,038,113	1,660,785
Commitments and contingencies
Stockholders' Equity:
Preferred stock, $0.01 par value; 1,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.01 par value; 100,000,000 shares authorized; 51,899,229 and 51,790,608 shares issued at September 30, 2011 and December 31, 2010, respectively	519	518
Additional paid-in capital	247,200	246,085
Retained earnings	657,016	833,133
Common stock held in treasury, at cost; 11,772,062 and 10,524,757 shares at September 30, 2011 and December 31, 2010, respectively	(232,355)	(220,161)
Accumulated other comprehensive income (net of tax)	6,833	10,493
Total stockholders' equity	679,213	870,068
Total liabilities and stockholders' equity	$ 2,717,326	$ 2,530,853