Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from Operating Activities:
Net income	$ 16,733	$ 13,620
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,161	13,034
Deferred income tax expense	8,385us-gaap_DeferredIncomeTaxExpenseBenefit	2,551us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for doubtful accounts	268us-gaap_ProvisionForDoubtfulAccounts	150us-gaap_ProvisionForDoubtfulAccounts
Non-cash share based compensation	4,885us-gaap_ShareBasedCompensation	3,759us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:
Cash restricted or segregated under regulations and other	187	(11)
Deposits with clearing organizations	(17,147)	27,952
Securities owned, at fair value	(544)	(1,327)
Receivables from brokers, dealers and clearing organizations	(237,220)	51,351
Receivables from customers	(2,090)us-gaap_IncreaseDecreaseInReceivables	3,062us-gaap_IncreaseDecreaseInReceivables
Accounts payable and accrued expenses	(35,315)	(13,973)
Payables to brokers, dealers and clearing organizations	188,964	(65,062)
Payables to customers	18,638	9,157
Securities sold, not yet purchased, at fair value	717	1,158
Income taxes receivable/payable	(8,551)	411
Excess tax benefit from share-based payment arrangements	(2,476)	(990)
Other, net	(2,448)	(6,841)
Net cash (used in) provided by operating activities	(55,853)	38,001
Cash flows from Investing Activities:
Capital purchases	(1,399)	(2,589)
Capitalization of software development costs	(6,467)	(6,745)
Net cash used in investing activities	(7,866)	(9,334)
Cash flows from Financing Activities:
Repayments of long term debt	(3,169)us-gaap_RepaymentsOfLongTermDebt	(3,120)us-gaap_RepaymentsOfLongTermDebt
Proceeds from (repayments of) borrowing under short-term bank loans	28,908	(46,480)
Excess tax benefit from share-based payment arrangements	2,476	990
Common stock issued	1,068	429
Common stock repurchased	(16,425)	(12,717)
Shares withheld for net settlements of share-based awards	(8,069)	(5,238)
Net cash provided by (used in) financing activities	4,789	(66,136)
Effect of exchange rate changes on cash and cash equivalents	(10,518)	(1,767)
Net decrease in cash and cash equivalents	(69,448)	(39,236)
Cash and cash equivalents - beginning of year	275,210	261,897
Cash and cash equivalents - end of period	205,762	222,661
Supplemental cash flow information
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Income taxes paid	$ 5,352us-gaap_IncomeTaxesPaidNet	$ 1,838us-gaap_IncomeTaxesPaidNet

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-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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