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Financial Instruments And Risk Management (Financial Assets And Liabilities Carried At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Cash equivalents $ 60,676 $ 152,331
Trading securities 7,218 6,760
Available-for-sale fixed income investments 23,761 23,754
Available-for-sale equity securities 62 172
Total assets at fair value 649,044 [1] 676,592 [1]
Total liabilities at fair value 936,110 [1] 905,603 [1]
Contingent consideration 383,751 376,110
Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Cash equivalents 60,676 152,331
Trading securities 7,218 6,760
Available-for-sale fixed income investments      
Available-for-sale equity securities 62 172
Total assets at fair value 67,956 [1] 159,263 [1]
Total liabilities at fair value    [1]    [1]
Contingent consideration      
Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Cash equivalents      
Trading securities      
Available-for-sale fixed income investments 23,761 23,754
Available-for-sale equity securities      
Total assets at fair value 581,088 [1] 517,329 [1]
Total liabilities at fair value 552,359 [1] 529,493 [1]
Contingent consideration      
Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Cash equivalents      
Trading securities      
Available-for-sale fixed income investments      
Available-for-sale equity securities      
Total assets at fair value    [1]    [1]
Total liabilities at fair value 383,751 [1] 376,110 [1]
Contingent consideration 383,751 376,110
Money Market Funds [Member]
   
Derivatives, Fair Value [Line Items]    
Cash equivalents 60,676 152,331
Money Market Funds [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Cash equivalents 60,676 152,331
Money Market Funds [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Cash equivalents      
Money Market Funds [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Cash equivalents      
Equity Securities-Exchange Traded Funds [Member]
   
Derivatives, Fair Value [Line Items]    
Trading securities 7,218 6,760
Equity Securities-Exchange Traded Funds [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Trading securities 7,218 6,760
Equity Securities-Exchange Traded Funds [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Trading securities      
Equity Securities-Exchange Traded Funds [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Trading securities      
Biosciences Industry [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale equity securities 62 172
Biosciences Industry [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale equity securities 62 172
Biosciences Industry [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale equity securities      
Biosciences Industry [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale equity securities      
U.S. Treasuries [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments 12,193 1,519
U.S. Treasuries [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments      
U.S. Treasuries [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments 12,193 1,519
U.S. Treasuries [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments      
Corporate Bonds [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments 7,630 7,192
Corporate Bonds [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments      
Corporate Bonds [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments 7,630 7,192
Corporate Bonds [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments      
Agency Mortgage-Backed Securities [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments 1,395 12,346
Agency Mortgage-Backed Securities [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments      
Agency Mortgage-Backed Securities [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments 1,395 12,346
Agency Mortgage-Backed Securities [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments      
Other [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments 2,543 2,697
Other [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments      
Other [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments 2,543 2,697
Other [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Available-for-sale fixed income investments      
Foreign Exchange Derivative Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value 7,129 3,802
Foreign Exchange Derivative Assets [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value      
Foreign Exchange Derivative Assets [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value 7,129 3,802
Foreign Exchange Derivative Assets [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value      
Interest Rate Swaps [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value 38,598 29,773
Interest Rate Swaps [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value      
Interest Rate Swaps [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value 38,598 29,773
Interest Rate Swaps [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value      
Purchased Cash Convertible Note Hedge [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value 511,600 460,000
Purchased Cash Convertible Note Hedge [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value      
Purchased Cash Convertible Note Hedge [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value 511,600 460,000
Purchased Cash Convertible Note Hedge [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Total assets at fair value      
Foreign Exchange Derivative Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value 38,003 68,835
Foreign Exchange Derivative Liabilities [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value      
Foreign Exchange Derivative Liabilities [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value 38,003 68,835
Foreign Exchange Derivative Liabilities [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value      
Interest Rate Swap Derivative Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value 2,756 658
Interest Rate Swap Derivative Liabilities [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value      
Interest Rate Swap Derivative Liabilities [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value 2,756 658
Interest Rate Swap Derivative Liabilities [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value      
Cash Conversion Feature Of Cash Convertible Notes [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value 511,600 460,000
Cash Conversion Feature Of Cash Convertible Notes [Member] | Level 1 [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value      
Cash Conversion Feature Of Cash Convertible Notes [Member] | Level 2 [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value 511,600 460,000
Cash Conversion Feature Of Cash Convertible Notes [Member] | Level 3 [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value      
[1] The Company chose not to elect the fair value option for its financial assets and liabilities that had not been previously carried at fair value. Therefore, material financial assets and liabilities not carried at fair value, such as short-term and long-term debt obligations and trade accounts receivable and payable, are still reported at their carrying values.