Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from Operating Activities:
Net income (loss)	$ 21,423	$ (241,406)
Adjustments to reconcile net income (loss) to net cash used in operating activities
Depreciation and amortization	40,281	42,655
Deferred income tax expense (benefit)	1,121	(23,465)
Provision for doubtful accounts	(671)	1,361
Share-based compensation	15,056	10,855
Non-cash restructuring charges	357
Fixed asset disposal	649
Goodwill impairment		274,285
Changes in operating assets and liabilities:
Cash restricted or segregated under regulations and other	(9,399)	6,444
Deposits with clearing organizations	(3,327)	2,077
Securities owned, at fair value	(2,019)	(3,307)
Receivables from brokers, dealers and clearing organizations	(539,304)	(408,129)
Receivables from customers	(398,998)	(61,084)
Accounts payable and accrued expenses	8,154	(34,472)
Payables to brokers, dealers and clearing organizations	187,119	67,140
Payables to customers	712,819	385,165
Securities sold, not yet purchased, at fair value	2,149	4,132
Income taxes receivable/payable	14,240	(2,739)
Excess tax benefit	(219)
Other, net	(2,128)	43
Net cash provided by operating activities	47,303	19,555
Cash flows from Investing Activities:
Investment in unconsolidated affiliates	(474)
Capital purchases	(29,757)	(16,152)
Capitalization of software development costs	(17,152)	(19,015)
Net cash used in investing activities	(47,383)	(35,167)
Cash flows from Financing Activities:
Repayments of long term debt	(6,515)	(5,327)
Proceeds from borrowing under short-term bank loans	30,332	13,833
Proceeds from sales-leaseback transaction	20,562	1,901
Common stock issued	162	2,660
Common stock repurchased	(24,001)	(17,540)
Shares withheld for net settlements of share-based awards	(3,715)	(2,306)
Excess tax benefit	219
Net cash provided by (used in) financing activities	17,044	(6,779)
Effect of exchange rate changes on cash and cash equivalents	(1,272)	1,093
Net increase (decrease) in cash and cash equivalents	15,692	(21,298)
Cash and cash equivalents - beginning of year	245,875	284,188
Cash and cash equivalents - end of period	261,567	262,890
Supplemental cash flow information
Interest paid	2,270	2,105
Income taxes (refunded) paid	$ (4,546)	$ 5,456