Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Revenues :	$ 100,883	$ 54,292	$ 216,579	$ 105,942
Cost of sales (includes amortization of acquired intangible assets of $2,080, $772, $3,591, and $1,730)	64,227	36,579	123,774	69,253
Gross profit	36,656	17,713	92,805	36,689
Expenses and other income:
Engineering and technology	2,448	1,784	5,021	3,448
Sales and marketing	8,869	4,902	28,312	11,869
General and administrative	5,356	4,970	16,422	10,130
Depreciation	532	552	1,067	1,214
Amortization of intangible assets	3,168		5,281
Other loss (income), net	930	(107)	2,485	(182)
Total expenses and other loss/income	21,303	12,101	58,588	26,479
Income from continuing operations before income taxes	15,353	5,612	34,217	10,210
Income tax expense	(5,655)	(1,936)	(13,113)	(3,638)
Income from continuing operations	9,698	3,676	21,104	6,572
Discontinued operations:
Loss from discontinued operations, net of taxes		(680)		(2,253)
Loss on sale of discontinued operations, net of tax		(7,674)		(7,674)
Net income (loss)	9,698	(4,678)	21,104	(3,355)
Income (loss) per share - Basic
Income from continuing operations	$ 0.24	$ 0.10	$ 0.53	$ 0.18
Loss from discontinued operations		$ (0.02)		$ (0.06)
Loss on sale of discontinued operations		$ (0.20)		$ (0.21)
Basic net income (loss) per share	$ 0.24	$ (0.12)	$ 0.53	$ (0.09)
Weighted average shares outstanding used in computing basic income (loss) per share	40,116	37,422	39,904	36,883
Income (loss) per share - Diluted
Income from continuing operations	$ 0.23	$ 0.10	$ 0.51	$ 0.18
Loss from discontinued operations		$ (0.02)		$ (0.06)
Loss on sale of discontinued operations		$ (0.20)		$ (0.21)
Diluted net income (loss) per share	$ 0.23	$ (0.12)	$ 0.51	$ (0.09)
Weighted average shares outstanding used in computing diluted income (loss) per share	41,245	38,128	41,112	37,609
Other comprehensive income (loss):
Net income (loss)	9,698	(4,678)	21,104	(3,355)
Unrealized loss on investments, available-for-sale	(15)	(18)	(9)	11
Unrealized loss on derivative instrument	(278)		(278)
Reclassification adjustment for realized gain on investments, available-for-sale, net, included in net income	(26)		(26)
Other comprehensive income (loss)	(319)	(18)	(313)	11
Comprehensive income (loss)	$ 9,379	$ (4,696)	$ 20,791	$ (3,344)