Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities
Net loss from operations	$ (4,362)	$ (3,955)
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Depreciation and amortization	21,516	15,924
Loss on disposal of property and equipment	22	81
Amortization of bond premium	479
Realized loss on available-for-sale securities	32
Share-based compensation expense	4,350	2,786
Amortization of deferred financing costs	106	106
Bad debt expense (recoveries), net	(629)	802
Deferred income tax benefit	(1,804)	(961)
Changes in assets and liabilities, net of acquisitions
Accounts and unbilled receivables	(2,918)	(3,246)
Prepaid expenses and other current assets	(3,663)	(1,541)
Income tax receivable	146	16
Other long-term assets	(169)	1,240
Accounts payable	2,828	1,519
Accrued compensation and other accrued liabilities	155	(185)
Commissions payable	504	(269)
Deferred revenue	3,217	8,389
Other liabilities	(880)	(121)
Net cash provided by operating activities	18,930	20,585
Cash flows from investing activities
Capitalized software and purchases of property and equipment	(15,604)	(12,097)
Purchase of available-for-sale securities	(1,469)	(57,161)
Sales of available-for-sale securities	55,545
Acquisitions and variable interest entity, net of cash acquired	(42,236)	(9,682)
Net cash (used in) provided by investing activities	(3,764)	(78,940)
Cash flows from financing activities
Borrowings under revolving credit line		3,000
Repayments under revolving credit line and term loan	(2,500)	(27,000)
Repayments of notes payable	(74)	(87)
Repayments of capital lease obligations	(279)	(351)
Proceeds from common stock issued through Employee Stock Purchase Plan	339	236
Shares authorized, but not issued, to settle employees withholding liability	(76)
Net proceeds from option exercises	2,992	8,209
Net proceeds from public offering		91,669
Net cash provided by financing activities	402	75,676
Effect of exchange rate changes on cash and cash equivalents	(269)	638
Net increase in cash and cash equivalents	15,299	17,959
Cash and cash equivalents at beginning of period	67,459	52,455
Cash and cash equivalents at end of period	82,758	70,414
Supplemental disclosures of cash flow information
Interest expense	582	810
Income taxes paid	1,838	3,448
Income taxes refunded	245
Non-cash investing and financing activities
Capital lease obligations incurred	$ 555	$ 568