Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash Flows from Operating Activities:
Net income	$ 11,416	$ 79,355
Adjustments to reconcile net income to cash provided by operating activities
Loss on foreign currency exchange rates	345	326
Depreciation and amortization	5,556	1,649
Change in fair value of contingent liability	6
Deferred taxes	(855)	(2,611)
Amortization of deferred financing costs	44	44
Interest income	60	(19)
Bad debt provision	603	355
Loss on disposal of fixed assets	3	37
Stock compensation expense	2,393	3,198
Change in fair value of convertible, redeemable preferred stock embedded derivative		(60,283)
Changes in operating assets and liabilities:
Short term investments	(7)
Trading securities	20,000	5,007
Receivables from brokers	(2,359)	(5,620)
Prepaid assets	(543)	195
Other assets	3,882	3,475
Payables to customers	28,907	14,512
Accrued compensation and benefits	(2,653)	(1,062)
Payables to brokers, dealers, FCMs and other regulated entities	4,579	1,653
Accrued expenses and other liabilities	334	(665)
Income tax payable	(2,075)	8,501
Cash provided by operating activities	69,636	48,047
Cash Flows from Investing Activities:
Purchases of property and equipment	(1,862)	(2,676)
Purchase of subsidiary shares from noncontrolling interest		(427)
Purchase of intangible assets	(2,547)
Cash used for investing activities	(4,409)	(3,103)
Cash Flows from Financing Activities:
Deferred initial public offering costs		(73)
Payment on notes payable	(5,250)	(5,250)
Proceeds from exercise of stock options	378	21
Treasury stock purchases	(125)
Proceeds from exercise of warrants	1,270
Cash used for financing activities	(3,727)	(5,302)
Effect of exchange rate changes on cash and cash equivalents	371	4,911
Increase in cash and cash equivalents	61,871	44,553
Cash and cash equivalents - beginning of period	284,210	222,524
Cash and cash equivalents - end of period	346,081	267,077
Cash paid during the year for:
Interest	678	1,050
Taxes	4,925	1,704
Non-cash investing activities:
Purchase of fixed assets in accrued expense and other liabilities	53	65
Contingent liability for purchased intangibles acquisition	$ 7,154