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Acquisitions (Narrative) (Details) (USD $)	9 Months Ended		9 Months Ended			1 Months Ended		1 Months Ended	9 Months Ended			9 Months Ended		9 Months Ended
Acquisitions (Narrative) (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Surgient, Inc [Member] Cost Of Revenues [Member]	Sep. 30, 2011 Surgient, Inc [Member] General And Administrative [Member]	Sep. 30, 2011 Surgient, Inc [Member] Purchase Price Allocation Adjustments [Member]	Jan. 31, 2011 BakBone Software Incorporated [Member]	Sep. 30, 2011 BakBone Software Incorporated [Member]	Jan. 31, 2011 BakBone Software Incorporated [Member] IPR&D [Member]	Sep. 30, 2011 Volcker Informatik AG [Member]	Jul. 31, 2010 Volcker Informatik AG [Member]	Sep. 30, 2011 Volcker Informatik AG [Member] Earn-Out Contingency [Member]	Sep. 30, 2011 Surgient, Inc [Member]	Aug. 31, 2010 Surgient, Inc [Member]	Sep. 30, 2011 Surgient, Inc [Member] IPR&D [Member]	Sep. 30, 2011 Other Acquisitions [Member]
Percentage of voting interest acquired						100.00%				100.00%			100.00%
Cash consideration paid						$ 56,000,000				$ 20,200,000			$ 35,000,000
Total purchase price							55,980,000		22,169,000			35,000,000
Discount rate used for valuation of intangible assets								28.00%						12.00%
Goodwill allocation to licenses						45.00%			50.00%			55.00%
Goodwill allocation to maintenance services						52.00%			36.00%			37.00%
Goodwill allocation to professional services						3.00%			14.00%			8.00%
Additional acquisitions completed	three
Aggregate purchase price of other acquisitions															40,000,000
Allocation of purchase price to goodwill					6,100,000		20,730,000		13,930,000			26,011,000			20,000,000
Allocation of purchase price to intangibles															21,000,000
Allocation of purchase price to decrease deferred tax assets					6,100,000		(7,832,000)		2,645,000			(9,178,000)
Intangible assets, net book value	95,728,000	62,785,000										1,600,000
Impairment losses			800,000	800,000
Maximum potential payout									5,000,000		2,500,000
Estimated fair value of the earn-out contingency									$ 2,000,000