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Acquisitions (Allocation Of Purchase Price To Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Business Acquisition [Line Items]  
Goodwill 2,700
Total purchase price 6,000
Acquired Technologies [Member]
 
Business Acquisition [Line Items]  
Useful life of amortizable intangible assets (years) 5.2
Customer Relationships [Member]
 
Business Acquisition [Line Items]  
Useful life of amortizable intangible assets (years) 4.0
Trademarks And Trade Names [Member]
 
Business Acquisition [Line Items]  
Useful life of amortizable intangible assets (years) 10.0
BakBone Software Incorporated [Member]
 
Business Acquisition [Line Items]  
Current assets 12,479
Goodwill 18,690
Deferred income tax assets - non-current 9,872
Other non-current assets 2,419
Current liabilities (6,328)
Deferred revenue - current (9,383)
Deferred revenue - non-current (9,491)
Other long-term liabilities (278)
Total purchase price 55,980
BakBone Software Incorporated [Member] | Acquired Technologies [Member]
 
Business Acquisition [Line Items]  
Amortizable intangible assets 24,500
BakBone Software Incorporated [Member] | IPR&D [Member]
 
Business Acquisition [Line Items]  
Amortizable intangible assets 400
BakBone Software Incorporated [Member] | Customer Relationships [Member]
 
Business Acquisition [Line Items]  
Amortizable intangible assets 11,300
BakBone Software Incorporated [Member] | Trademarks And Trade Names [Member]
 
Business Acquisition [Line Items]  
Amortizable intangible assets 1,800