Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities:
Net income (loss)	$ 1,743	$ (1,894)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	3,384	3,442
Provision for bad debt	302	93
Amortization of investment premiums	349	852
Stock-based compensation expense	3,946	6,584
Deferred tax benefit	(217)	(415)
Excess tax benefit - stock options	(471)	(121)
Changes in operating assets and liabilities, net of businesses acquired:
Accounts receivable	(4,319)	(9,607)
Prepaid expenses and other current assets	(538)	110
Other assets	(89)	2
Accounts payable	269	175
Income taxes payable	689	121
Accrued expenses and other current liabilities	1,761	(735)
Accrued compensation expenses	(1,019)	563
Deferred revenue	2,189	365
Other liabilities	(618)	1,310
Net cash provided by operating activities	7,361	845
Investing activities:
Purchases of property and equipment, and other assets	(2,357)	(3,278)
Purchases of investments	(28,487)	(21,707)
Proceeds from sales and maturities of investments	13,145	23,175
Acquisition of businesses	(2,006)	(1,790)
Net cash used in investing activities	(19,705)	(3,600)
Financing activities:
Excess tax benefit--stock options	471	121
Proceeds from exercise of stock options	1,106	273
Net cash provided by financing activities	1,577	394
Net decrease in cash and cash equivalents	(10,767)	(2,361)
Cash and cash equivalents at beginning of period	32,584	20,884
Cash and cash equivalents at end of period	21,817	18,523
Supplemental disclosure of cash flow information:
Cash paid for interest	0	0
Cash paid for taxes	$ 1,347	$ 825