CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net revenues:
Recurring revenues	$ 291,486	$ 252,054	$ 229,305
Non-recurring revenues	34,762	31,447	30,203
Total net revenues	326,248	283,501	259,508
Cost of revenues:
Recurring revenues	62,329	51,261	46,823
Non-recurring revenues	39,623	29,175	30,104
Amortization of developed technology	8,820	6,374	5,618
Total cost of revenues	110,772	86,810	82,545
Gross margin	215,476	196,691	176,963
Operating expenses:
Sales and marketing	74,807	69,151	62,738
Product development	57,561	51,416	48,443
General and administrative	37,040	37,707	36,107
Amortization of other intangibles	2,807	1,272	1,666
Restructuring charges	696	840	130
Total operating expenses	172,911	160,386	149,084
Income from continuing operations	42,565	36,305	27,879
Interest expense	(188)	(54)	(484)
Interest income and other expense, net	(555)	(841)	(332)
Gain (loss) on equity investments, net	(500)		2,056
Income from continuing operations before income taxes	41,322	35,410	29,119
Provision for income taxes	12,991	11,091	8,345
Net income from continuing operations	28,331	24,319	20,774
Discontinued operation:
Net income (loss) from discontinued operation (net of applicable taxes of $1,197, $(46) and $5,639, respectively)	1,839	(166)	16,109
Net income	$ 30,170	$ 24,153	$ 36,883
Basic net income per share:
Continuing operations (in dollars per share)	$ 0.55	$ 0.47	$ 0.41
Discontinued operation (in dollars per share)	$ 0.04		$ 0.32
Total operations (in dollars per share)	$ 0.58	$ 0.47	$ 0.72
Diluted net income per share:
Continuing operations (in dollars per share)	$ 0.52	$ 0.45	$ 0.39
Discontinued operation (in dollars per share)	$ 0.03		$ 0.30
Total operations (in dollars per share)	$ 0.56	$ 0.44	$ 0.70
Weighted average shares used to compute basic and diluted net income per share
Basic (in shares)	51,797	51,535	50,899
Diluted (in shares)	54,085	54,476	52,909