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	$ 23,573	$ 14,973
Adjustment to net income for discontinued operation	(1,773)	98
Net income from continuing operations	21,800	15,071
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:
Stock-based compensation	14,167	13,638
Depreciation and amortization	16,254	13,289
Loss on disposition of fixed assets		22
Provision for doubtful accounts	159	148
Reduction of sales returns	(212)	(813)
Non-cash impairment loss	500
Deferred income taxes	(395)	(56)
Other	39	353
Effect of statement of operations adjustments	30,512	26,581
Changes in operating assets and liabilities:
Accounts receivable	(4,669)	(354)
Prepaid and other assets	(1,141)	4,770
Accounts payable	3,261	4,347
Accrued liabilities	(4,552)	(2,214)
Deferred revenues	5,987	(3,889)
Income taxes payable	4,412	7,548
Effect of changes in operating assets and liabilities	3,298	10,208
Net cash provided by operating activities from continuing operations	55,610	51,860
Cash flows from investing activities:
Cash used in acquisitions, net of cash acquired	(97,092)	(4,719)
Purchases of property and equipment	(7,679)	(14,995)
Capitalized software development costs	(2,280)	(1,599)
Purchases of marketable securities	(38,907)	(29,000)
Sales and maturities of marketable securities	85,432	19,000
Net cash used in investing activities from continuing operations	(60,526)	(31,313)
Cash flows from financing activities:
Proceeds from common stock issued from exercises of stock options	5,482	10,943
Withholding taxes related to equity award net share settlement	(5,111)	(4,342)
Proceeds from common stock issued under the employee stock purchase plan	3,146	2,929
Excess tax benefits from stock-based compensation	4,195
Repurchase of common stock	(51,582)	(35,881)
Net cash used in financing activities from continuing operations	(43,870)	(26,351)
Net cash transferred (to) from discontinued operation	2,954	(76)
Effect of exchange rate changes on cash and cash equivalents	215	(87)
Net change in cash and cash equivalents from continuing operations	(45,617)	(5,967)
Cash and cash equivalents of continuing operations at beginning of period	81,948	57,877
Cash and cash equivalents of continuing operations at end of period	36,331	51,910
Cash flow from discontinued operation:
Net cash used in operating activities	(50)	(341)
Net cash provided by investing activities	3,004
Net cash transferred from (to) continuing operations	(2,954)	76
Effect of exchange rates on cash and cash equivalents		(1)
Net change in cash and cash equivalents from discontinued operations		(266)
Cash and cash equivalents of discontinued operation at beginning of period	0	266
Cash and cash equivalents of discontinued operation at end of period	$ 0	$ 0