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Acquisitions (Summary Of Purchase Price Allocation) (Details) (Global 360 Holding Corporation [Member], USD $)
 0 Months Ended
Jul. 13, 2011
Business Acquisition [Line Items]  
Current assets (inclusive of cash acquired of $10,944) $ 38,249,000
Cash acquired from acquisition 10,944,000
Non-current assets 6,289,000
Total liabilities assumed (88,575,000) [1]
Total identifiable net assets 54,663,000
Goodwill 201,934,000
Fair value of total consideration transferred 256,597,000
Deferred revenue included in total liabilities assumed 24,300,000
Customer Assets [Member]
  
Business Acquisition [Line Items]  
Intangible assets 58,100,000
Technology Assets [Member]
  
Business Acquisition [Line Items]  
Intangible assets $ 40,600,000
[1] Included in total liabilities assumed is approximately $24.3 million of deferred revenue.