Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from Operating Activities:
Net income	$ 6,523	$ 26,546
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,273	25,865
Deferred income tax expense	7,842	3,859
Provision for doubtful accounts	366	276
Non-cash share based compensation	9,511	8,334
Changes in operating assets and liabilities:
Cash restricted or segregated under regulations and other	2,604	(424)
Deposits with clearing organizations	(37,506)	31,295
Securities owned, at fair value	903	(6,764)
Receivables from brokers, dealers and clearing organizations	(368,633)	194,712
Receivables from customers	2,255	(102,362)
Accounts payable and accrued expenses	(8,202)	(2,215)
Payables to brokers, dealers and clearing organizations	355,782	(219,882)
Payables to customers	20,627	15,014
Securities sold, not yet purchased, at fair value	(682)	6,179
Income taxes receivable/payable	(13,084)	164
Excess tax benefit from share-based payment arrangements	(2,878)	(1,007)
Other, net	(4,802)	(8,448)
Net cash (used in) operating activities	(7,101)	(28,858)
Cash flows from Investing Activities:
Capital purchases	(3,668)	(5,994)
Capitalization of software development costs	(13,310)	(13,633)
Net cash used in investing activities	(16,978)	(19,627)
Cash flows from Financing Activities:
Repayments of long term debt	(5,819)	(6,251)
Proceeds from (repayments of) borrowing under short-term bank loans	2,789	68,115
Excess tax benefit from share-based payment arrangements	2,878	1,007
Common stock issued	1,286	445
Common stock repurchased	(24,562)	(27,047)
Dividend paid	(2,358)
Shares withheld for net settlements of share-based awards	(8,300)	(6,426)
Net cash (used in) provided by financing activities	(34,086)	29,843
Effect of exchange rate changes on cash and cash equivalents	(5,258)	(4,140)
Net decrease in cash and cash equivalents	(63,423)	(22,782)
Cash and cash equivalents - beginning of year	275,210	261,897
Cash and cash equivalents - end of period	211,787	239,115
Supplemental cash flow information
Interest paid	1,688	1,866
Income taxes paid	$ 12,004	$ 4,629