Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities
Net income	$ 4,778	$ 5,678
Adjustments to reconcile net income including non-controlling interests to net cash provided by operating activities:
Depreciation and amortization of property and equipment	8,894	5,401
Amortization of intangible assets	1,392	1,922
Stock-based compensation	2,275	684
Forgiveness of note receivable from stockholder	103
Unbilled receivables	(304)	739
Change in fair value of preferred stock warrants	140
Changes in operating assets and liabilities:
Accounts receivable	2,054	1,017
Prepaid expenses and other assets	54	(1,562)
Accounts payable	55	421
Accrued expenses and other liabilities	(356)	(1,687)
Deferred revenue	901	5,578
Net cash provided by operating activities	19,986	18,191
Cash flows from investing activities
(Increase) decrease in restricted cash	(65)	848
Sales of short-term marketable securities	1,000
Purchases of property and equipment	(13,154)	(5,896)
Contractual payments related to business acquisition	(127)	(138)
Net cash used in investing activities	(12,346)	(5,186)
Cash flows from financing activities
Payments of capital leases	(330)	(505)
Payments to non-controlling interests	(547)	(399)
Proceeds from exercise of stock options	602	1
Proceeds from issuance of common stock upon initial public offering	48,297
Offering costs	(2,529)
Net cash provided by (used in) financing activities	45,493	(903)
Net increase in cash and cash equivalents	53,133	12,102
Cash and cash equivalents at beginning of period	25,721	22,629
Cash and cash equivalents at end of period	78,854	34,731
Supplemental disclosure of cash flow information
Cash paid for interest	11	23
Cash paid for taxes	1,194	1,027
Supplemental disclosure of non-cash investing and financing activities
Conversion of convertible preferred stock into common stock	124,602
Retirement of treasury stock	4,575
Property and equipment and software maintenance costs in accounts payable, accrued expenses and other liabilities	2,247	2,011
Accretion of convertible preferred stock	1,633	3,826
Exercise and conversion of preferred stock warrants into common stock	272
Contractual obligation related to business acquisition in accrued expenses and other liabilities	43	57
Acquisition of software and equipment under capital leases		$ 73