Acquisitions (Narrative) (Details) (USD $)	6 Months Ended		6 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	1 Months Ended			1 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended					1 Months Ended		3 Months Ended	6 Months Ended			1 Months Ended
	Jun. 30, 2012 Podio [Member]	Apr. 30, 2012 Podio [Member]	Jun. 30, 2012 Podio [Member] Core And Product Technologies [Member] Y	Jun. 30, 2012 2012 Acquisition [Member]	Jun. 30, 2012 2012 Acquisition [Member] Core And Product Technologies [Member] Y	Jun. 30, 2012 Other 2012 Acquisitions, Private Company [Member]	Jun. 30, 2012 Other 2012 Acqusitions, Two Private Companies [Member]	Jun. 30, 2012 Other 2012 Acqusitions, Two Private Companies [Member]	Nov. 30, 2011 App Dna [Member]	Nov. 30, 2011 App Dna [Member] Product Related Technologies [Member]	Nov. 30, 2011 App Dna [Member] Other Intangible Assets [Member]	Aug. 31, 2011 Ringcube [Member]	Jun. 30, 2012 Ringcube [Member]	Aug. 31, 2011 Ringcube [Member] Product Related Technologies [Member]	Aug. 31, 2011 Ringcube [Member] Other Intangible Assets [Member]	Jun. 30, 2011 Netviewer AG [Member]	Jun. 30, 2012 Netviewer AG [Member]	Jun. 30, 2011 Netviewer AG [Member]	Feb. 28, 2011 Netviewer AG [Member]	Jun. 30, 2012 Netviewer AG [Member] Core And Product Technologies [Member]	Jun. 30, 2012 Netviewer AG [Member] Other Intangible Assets [Member]	May 31, 2011 Kaviza, Inc. [Member]	Jul. 31, 2011 Cloud.Com [Member]	Jun. 30, 2012 Cloud.Com [Member]	Jun. 30, 2012 Cloud.Com [Member]	Jul. 31, 2011 Cloud.Com [Member] Product Related Technologies [Member]	Jul. 31, 2011 Cloud.Com [Member] Other Intangible Assets [Member]	Oct. 31, 2011 ShareFile [Member]	Oct. 31, 2011 ShareFile [Member] Product Related Technologies [Member]	Oct. 31, 2011 ShareFile [Member] Other Intangible Assets [Member]	Jun. 30, 2012 Other Acquisition [Member]	Jul. 31, 2012 Acquisition [Member] Bytemobile [Member]
Total consideration in business acquisitions		$ 43,600,000				$ 24,600,000	$ 15,400,000	$ 15,400,000	$ 91,300,000			$ 32,200,000							$ 107,500,000				$ 158,800,000					$ 54,000,000			$ 10,500,000	$ 401,700,000
Cash acquired in business combination		1,700,000				600,000	200,000	200,000	3,200,000			500,000							6,300,000				5,600,000					1,700,000				4,300,000
Transaction costs		500,000				500,000	400,000	400,000	1,300,000			600,000							3,100,000					2,900,000	2,900,000			700,000				2,200,000
Transaction costs expensed in period						400,000	200,000	400,000					100,000			400,000		800,000						600,000	600,000
Assets acquired	52,042,000			69,814,000
Acquired Finite-lived Intangible Asset, Amount	24,600,000		20,700,000	25,403,000	23,303,000				44,800,000	36,700,000	8,100,000	30,600,000		26,000,000	4,600,000		28,800,000			3,200,000	25,600,000		89,000,000			58,000,000	31,000,000	28,200,000	16,000,000	12,200,000
Weighted Average Life (in years)			5.0		4.5
Goodwill	25,503,000			42,326,000					58,200,000			15,600,000					98,700,000						100,600,000					49,400,000
Additional investment in the consolidated subsidiary																						$ 17,200,000
Stock units converted and assumed	127,668					13,481	66,459		114,487			58,439					99,100					88,687	288,742					180,697
Stock options converted and assumed						12,017																33,301	183,780					390,775
Equity interest in subsidiary																						100.00%