v2.4.0.6
Fair Value Measurements (Summary Of Assets and Liabilities Recorded At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities $ 566,416 $ 9,072,646    
Equity securities 0 8,503    
Derivatives, assets 51,958 100,475    
Fair value, total 618,374 9,181,624    
Contingent Consideration 138,328 135,591 11,100 11,100
Derivatives, liabilities 18,404 5,710    
Fair value, total 156,732 141,301    
Money Market Funds [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 518,248 7,455,982    
Certificates of Deposit [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 1,139,982    
Non-U.S. Government Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 24,741    
Corporate Debt Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 404,989    
Student Loan-Backed Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 48,168 46,952    
Level 1 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 518,248 7,455,982    
Equity securities 0 8,503    
Derivatives, assets 0 0    
Fair value, total 518,248 7,464,485    
Contingent Consideration 0 0    
Derivatives, liabilities 0 0    
Fair value, total 0 0    
Level 1 [Member] | Money Market Funds [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 518,248 7,455,982    
Level 1 [Member] | Certificates of Deposit [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 0    
Level 1 [Member] | Non-U.S. Government Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 0    
Level 1 [Member] | Corporate Debt Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 0    
Level 1 [Member] | Student Loan-Backed Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 0    
Level 2 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 1,544,971    
Equity securities 0 0    
Derivatives, assets 51,958 100,475    
Fair value, total 51,958 1,645,446    
Contingent Consideration 0 0    
Derivatives, liabilities 18,404 5,710    
Fair value, total 18,404 5,710    
Level 2 [Member] | Money Market Funds [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 0    
Level 2 [Member] | Certificates of Deposit [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 1,139,982    
Level 2 [Member] | Non-U.S. Government Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 0    
Level 2 [Member] | Corporate Debt Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 404,989    
Level 2 [Member] | Student Loan-Backed Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 0    
Level 3 [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 48,168 71,693    
Equity securities 0 0    
Derivatives, assets 0 0    
Fair value, total 48,168 71,693    
Contingent Consideration 138,328 135,591    
Derivatives, liabilities 0 0    
Fair value, total 138,328 135,591    
Level 3 [Member] | Money Market Funds [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 0    
Level 3 [Member] | Certificates of Deposit [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 0    
Level 3 [Member] | Non-U.S. Government Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 24,741    
Level 3 [Member] | Corporate Debt Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities 0 0    
Level 3 [Member] | Student Loan-Backed Securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated Fair Value, Debt securities $ 48,168 $ 46,952