Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ 5,690	$ (10,402)	$ 1,765
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	4,183	3,325	3,800
Amortization	21,643	19,889	21,016
Gain on sale of real estate	0	(2,744)	0
Share-based compensation	9,019	8,115	5,572
Note Receivable Impairment	1,663	0	0
Cease use loss	744	0	0
Change in fair value of contingent consideration liabilities	9	78	78
Contingent compensation expense	2,826	897	847
Amortization of premium on marketable debt securities	924	1,244	1,739
Amortization of discount on promissory notes receivable	(762)	(892)	(155)
Release of valuation allowance against deferred tax assets	(3,566)	(334)	(1,120)
Deferred income taxes	1,004	(1,100)	(2,105)
Excess tax benefit from exercise of stock options	0	(19)	(169)
Net gain on sale of cost method investment	0	0	(18,970)
Write-off of intangible asset in connection with the sale of intellectual property	0	0	4,303
Gain on sale of intellectual property	(25,895)	0	0
Unrealized losses on foreign currency forward contracts	(133)	(18)	117
Other	826	(685)	(390)
Changes in operating assets and liabilities:
Trade receivables	7,586	(5,781)	(6,304)
Prepaid expense and other current assets	(1,310)	1,769	1,578
Other assets	152	82	1,444
Accounts payable	(1,483)	(437)	(802)
Accrued liabilities, compensation and benefits	(7,972)	1,469	(2,579)
Deferred revenue	(4,171)	3,791	14,070
Net cash provided by operating activities	10,977	18,247	23,735
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(67,453)	(35,229)	(44,564)
Deposit for business acquisitions	5,202	(5,476)	0
Acquisition-related prepaid contingent compensation	0	0	(2,000)
Purchases of property and equipment, net	(11,486)	(6,332)	(3,908)
Net proceeds from sale of real estate	0	6,800	0
Purchases of marketable securities	(32,436)	(51,031)	(104,110)
Proceeds from maturities and sales of marketable securities	42,114	80,613	81,505
Net proceeds from sale of cost method investment	0	0	37,293
Proceeds from promissory notes receivable	26,502	816	0
Net decrease in restricted cash	3,226	329	275
Net cash provided by (used in) investing activities	(34,331)	(9,510)	(35,509)
Cash flows from financing activities:
Payment of contingent consideration liabilities	(250)	(250)	0
Proceeds from issuance of common stock	6,535	7,356	2,991
Common stock tendered for payment of withholding taxes	(2,046)	(1,190)	(914)
Excess tax benefit from exercise of stock options	0	19	169
Repurchases of common stock	(15,047)	(11,290)	(7,000)
Net cash (used in) provided by financing activities	(10,808)	(5,355)	(4,754)
Effect of changes in exchange rates on cash and cash equivalents	(957)	(245)	(178)
Increase (decrease) in cash and cash equivalents	(35,119)	3,137	(16,706)
Cash and cash equivalents at beginning of the year	72,747	69,610	86,316
Cash and cash equivalents at end of the year	37,628	72,747	69,610
Supplemental cash flow information:
Cash (received) paid during the year for income taxes, net of refunds	2,251	2,690	(1,181)
Non-cash investing and financing activities:
Note receivable received in sale of intellectual property	0	0	25,974
Deferred gain on sale of intellectual property	$ 0	$ 0	$ (25,974)