Acquisitions (Estimated Fair Values Of Assets Acquired And Liabilities Assumed) (Details) (USD $) In Thousands, unless otherwise specified						9 Months Ended
	Sep. 30, 2012 Netviewer AG [Member]	Sep. 30, 2012 Podio [Member]	Sep. 30, 2012 2012 Acquisition [Member]	Sep. 30, 2012 Bytemobile [Member]	Jul. 31, 2011 Cloud.Com [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2012 Minimum [Member] Podio [Member]	Sep. 30, 2012 Minimum [Member] 2012 Acquisition [Member]	Sep. 30, 2012 Minimum [Member] Bytemobile [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Maximum [Member] Podio [Member]	Sep. 30, 2012 Maximum [Member] 2012 Acquisition [Member]	Sep. 30, 2012 Maximum [Member] Bytemobile [Member]
Current assets		$ 1,906	$ 2,585	$ 62,194
Other assets		33	75	7,406
Property and equipment		0	209	2,464
Deferred tax assets, non-current		0	0	39,976
Intangible assets		24,600	29,002	251,400
Goodwill	98,700	25,503	44,794	202,113	100,600
Assets acquired		52,042	76,665	565,553
Current liabilities assumed		(609)	(7,494)	(58,723)
Long-term liabilities assumed		0	(7,760)	(4,195)
Deferred tax liabilities, non-current		(6,150)	(11,039)	(96,375)
Net assets acquired		$ 45,283	$ 50,372	$ 406,260
Intangible asset life						3 years	4 years	3 years	1 year	7 years	5 years	5 years	9 years