Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from Operating Activities:
Net (loss) income	$ (7,723)	$ 6,523
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Depreciation and amortization	21,684	22,273
Deferred income tax (benefit) expense	(4,415)	7,842
Provision for doubtful accounts	18	366
Non-cash share based compensation	14,488	9,511
Gain on sale of investment research operations	(21)
Changes in operating assets and liabilities:
Cash restricted or segregated under regulations and other	(428)	2,604
Deposits with clearing organizations	(27,250)	(37,506)
Securities owned, at fair value	1,275	903
Receivables from brokers, dealers and clearing organizations	634,175	(368,633)
Receivables from customers	(136,599)	2,255
Accounts payable and accrued expenses	(5,898)	(8,202)
Payables to brokers, dealers and clearing organizations	(690,584)	355,782
Payables to customers	64,422	20,627
Securities sold, not yet purchased, at fair value	(1,016)	(682)
Income taxes receivable/payable	(11,585)	(13,084)
Excess tax benefit from share-based payment arrangements	(989)	(2,878)
Other, net	(4,320)	(4,802)
Net cash used in operating activities	(154,766)	(7,101)
Cash flows from Investing Activities:
Capital purchases	(5,493)	(3,668)
Capitalization of software development costs	(12,670)	(13,310)
Proceeds from sale of investment research operations, net of deal costs	6,125
Net cash used in investing activities	(12,038)	(16,978)
Cash flows from Financing Activities:
Repayments of long term debt	(3,109)	(5,819)
Proceeds from borrowing under short-term bank loans	84,071	2,789
Debt issuance costs	(810)
Excess tax benefit from share-based payment arrangements	989	2,878
Common stock issued	3,075	1,286
Common stock repurchased	(14,946)	(24,562)
Dividends paid	(4,601)	(2,358)
Shares withheld for net settlements of share-based awards	(6,529)	(8,300)
Net cash provided by (used in) financing activities	58,140	(34,086)
Effect of exchange rate changes on cash and cash equivalents	15,523	(5,258)
Net decrease in cash and cash equivalents	(93,141)	(63,423)
Cash and cash equivalents - beginning of year	330,653	275,210
Cash and cash equivalents - end of period	237,512	211,787
Supplemental cash flow information:
Interest paid	2,156	1,688
Income taxes paid	$ 10,336	$ 12,004