Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from Operating Activities:
Net income	$ 26,546	$ 13,708
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	25,865	26,898
Deferred income tax expense	3,859	579
Provision for doubtful accounts	276	(435)
Share-based compensation	8,334	10,132
Non-cash restructuring charges		357
Fixed asset disposal		649
Changes in operating assets and liabilities:
Cash restricted or segregated under regulations and other	(424)	(4,331)
Deposits with clearing organizations	31,295	4,930
Securities owned, at fair value	(6,764)	2,909
Receivables from brokers, dealers and clearing organizations	(690,374)	(82,533)
Receivables from customers	(706,514)	(624,406)
Accounts payable and accrued expenses	(2,215)	8,270
Payables to brokers, dealers and clearing organizations	653,266	253,467
Payables to customers	631,104	432,803
Securities sold, not yet purchased, at fair value	6,179	(2,539)
Income taxes receivable/payable	164	14,539
Excess tax benefit from share-based payment arrangements	(1,007)	(207)
Other, net	(8,448)	(5,922)
Net cash (used in) provided by operating activities	(28,858)	48,868
Cash flows from Investing Activities:
Investment in unconsolidated affiliates		(474)
Capital purchases	(5,994)	(20,574)
Capitalization of software development costs	(13,633)	(11,836)
Net cash used in investing activities	(19,627)	(32,884)
Cash flows from Financing Activities:
Repayments of long term debt	(6,251)	(3,712)
Proceeds from borrowing under short-term bank loans	68,115	7,957
Proceeds from sales-leaseback transaction		18,157
Excess tax benefit from share-based payment arrangements	1,007	207
Common stock issued	445	497
Common stock repurchased	(27,047)	(17,938)
Shares withheld for net settlements of share-based awards	(6,426)	(3,617)
Net cash provided by financing activities	29,843	1,551
Effect of exchange rate changes on cash and cash equivalents	(4,140)	(4,376)
Net (decrease) increase in cash and cash equivalents	(22,782)	13,159
Cash and cash equivalents - beginning of year	261,897	245,875
Cash and cash equivalents - end of period	239,115	259,034
Supplemental cash flow information
Interest paid	1,866	1,552
Income taxes paid (refunded)	$ 4,629	$ (7,149)