Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net income	$ 15,983	$ 7,090
Adjustments to reconcile net income to net cash used in operations:
Depreciation and amortization	6,276	4,399
Employee stock based compensation	18,681	10,847
Deferred income taxes	0	(2,275)
Excess tax benefits from equity-based awards	(16,874)	(1,284)
Changes in operating assets and liabilities:
Accounts receivable	(52,838)	(28,119)
Prepaid taxes	13,367	274
Prepaid and other current assets	(1,234)	(1,296)
Accounts payable	(3,198)	8,192
Accrued service costs	25,755	7,585
Accrued compensation and benefits	(3,335)	(912)
Other accrued expenses	2,677	2,286
Accrued income taxes	0	1,615
Deferred rent expense	114	1,965
Deferred revenue	(2,707)	(3,363)
Net cash used in operating activities	2,667	7,004
Investing activities:
Purchases of furniture and equipment	(5,248)	(5,554)
Acquisition of software	(3,769)	(4,104)
Collection (issuance) of note receivable	1,650	(619)
Net cash used in investing activities	(7,367)	(10,277)
Financing activities:
Proceeds from the initial public offering, net of issuance costs	0	83,756
Liquidation preference payment	0	(866)
Proceeds from issuance of common stock from employee stock option exercise	15,039	171
Collection of non-executive employee notes receivable	41	79
Excess tax benefit from equity-based awards	16,874	1,284
Treasury stock purchases for employees' tax withholdings	(379)	0
Net cash provided by (used in) financing activities	31,575	84,424
Effect of exchange rate changes on cash	(354)	(200)
Net decrease in cash and cash equivalents	26,521	80,951
Cash and cash equivalents at beginning of period	155,573	43,659
Cash and cash equivalents at end of period	$ 182,094	$ 124,610