Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from Operating Activities:
Net loss	$ (241,638)	$ (186,594)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	28,493	29,265
Deferred income tax expense	(21,725)	(27,686)
Provision for doubtful accounts	851	28
Share-based compensation	5,994	8,397
Non-cash restructuring charges		2,298
Goodwill impairment	274,285	225,035
Changes in operating assets and liabilities:
Cash restricted or segregated under regulations and other	6,067	1,228
Deposits with clearing organizations	(44)	(5,332)
Securities owned, at fair value	(487)	15,328
Receivables from brokers, dealers and clearing organizations	(71,548)	(938,730)
Receivables from customers	(114,187)	(507,424)
Accounts payable and accrued expenses	(37,394)	(23,334)
Payables to brokers, dealers and clearing organizations	(77,284)	252,617
Payables to customers	230,573	1,166,388
Securities sold, not yet purchased, at fair value	1,321	(16,167)
Income taxes receivable/payable	(2,885)	(5,891)
Other, net	(2,424)	(1,123)
Net cash used in operating activities	(22,032)	(11,697)
Cash flows from Investing Activities:
Acquisitions of subsidiaries, net of cash acquired		(36,185)
Capital purchases	(11,835)	(11,059)
Capitalization of software development costs	(13,008)	(18,342)
Proceeds from sale of investments		2,095
Net cash used in investing activities	(24,843)	(63,491)
Cash flows from Financing Activities:
(Repayments of) proceeds from long term debt	(3,477)	19,874
Proceeds from borrowing under short-term bank loans	6,809	25,469
Proceeds from sales-leaseback transaction	1,901
Debt issuance costs		(2,908)
Common stock issued	2,116	5,973
Common stock repurchased	(13,183)	(17,828)
Shares withheld for net settlements of share-based awards	(2,250)	(4,993)
Net cash (used in) provided by financing activities	(8,084)	25,587
Effect of exchange rate changes on cash and cash equivalents	(401)	1,423
Net decrease in cash and cash equivalents	(55,360)	(48,178)
Cash and cash equivalents - beginning of year	284,188	317,010
Cash and cash equivalents - end of period	228,828	268,832
Supplemental cash flow information
Interest paid	1,392	751
Income taxes paid	$ 4,155	$ 7,561