Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements Of Cash Flows
Net income (loss)	$ 16,283	$ (253)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	4,488	2,903
Loss on disposal of fixed assets	46
Amortization of deferred financing costs	298	72
Accretion of premium on short-term investments	14
Deferred income taxes	(22,715)	(1,553)
Stock-based compensation	5,136	3,889
Changes in operating assets and liabilities:
Accounts receivable	4,122	(7,194)
Advances to customers	18	696
Prepaid expenses and other	(1,958)	(91)
Accounts payable	1,107	351
Accrued taxes	1,321	934
Accrued compensation and benefits	3,404	2,365
Accrued payables to customers	(30,644)	10,600
Other accrued liabilities	1,128	2,267
Net cash (used in) provided by operating activities	(17,952)	14,986
Cash flows from investing activities
Acquisition of property and equipment	(6,288)	(4,039)
Purchases of short-term investments, net	(42,273)
Cash used in investing activities	(48,561)	(4,039)
Cash flows from financing activities
Net proceeds from issuance of common stock in initial public offering	88,015
Proceeds from revolving credit facility	23,424
Repayment of revolving credit facility	(23,424)
Repayment on long-term debt	(15,582)	(768)
Payment of deferred debt issuance costs	(200)	(149)
Cash distributions to members		(2,517)
Proceeds from option exercises	2,247	352
Repurchases of common shares		(315)
Net cash provided by (used in) financing activities	74,480	(3,397)
Net increase in cash and cash equivalents	7,967	7,550
Effect of exchange rate changes on cash	752	(474)
Cash and cash equivalents at beginning of period	22,652	13,169
Cash and cash equivalents at end of period	$ 31,371	$ 20,245