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Financial Instruments And Risk Management (Financial Assets And Liabilities Carried At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 75,297 $ 152,331
Trading securities 9,572 6,760
Available-for-sale fixed income investments 22,617 23,754
Available-for-sale equity securities 51 172
Total assets at fair value 574,617 [1] 676,592 [1]
Total liabilities at fair value 891,641 [1] 905,603 [1]
Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 75,297 152,331
Trading securities 9,572 6,760
Available-for-sale fixed income investments 0 0
Available-for-sale equity securities 51 172
Total assets at fair value 84,920 [1] 159,263 [1]
Total liabilities at fair value 0 [1] 0 [1]
Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 0
Trading securities 0 0
Available-for-sale fixed income investments 22,617 23,754
Available-for-sale equity securities 0 0
Total assets at fair value 489,697 [1] 517,329 [1]
Total liabilities at fair value 498,302 [1] 529,493 [1]
Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 0
Trading securities 0 0
Available-for-sale fixed income investments 0 0
Available-for-sale equity securities 0 0
Total assets at fair value 0 [1] 0 [1]
Total liabilities at fair value 393,339 [1] 376,110 [1]
Money market funds
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 75,297 152,331
Money market funds | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 75,297 152,331
Money market funds | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 0
Money market funds | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 0
Equity securities - exchange traded funds
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 9,572 6,760
Equity securities - exchange traded funds | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 9,572 6,760
Equity securities - exchange traded funds | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Equity securities - exchange traded funds | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
US Treasuries
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 11,505 1,519
US Treasuries | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 0 0
US Treasuries | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 11,505 1,519
US Treasuries | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 0 0
Corporate bonds
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 7,283 7,192
Corporate bonds | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 0 0
Corporate bonds | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 7,283 7,192
Corporate bonds | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 0 0
Agency mortgage-backed securities
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 1,291 12,346
Agency mortgage-backed securities | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 0 0
Agency mortgage-backed securities | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 1,291 12,346
Agency mortgage-backed securities | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 0 0
Other
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 2,538 2,697
Other | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 0 0
Other | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 2,538 2,697
Other | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale fixed income investments 0 0
Biosciences industry
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale equity securities 51 172
Biosciences industry | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale equity securities 51 172
Biosciences industry | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale equity securities 0 0
Biosciences industry | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale equity securities 0 0
Foreign exchange derivative assets
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 4,132 3,802
Foreign exchange derivative assets | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 0 0
Foreign exchange derivative assets | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 4,132 3,802
Foreign exchange derivative assets | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 0 0
Interest rate swap derivative assets
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 36,848 29,773
Interest rate swap derivative assets | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 0 0
Interest rate swap derivative assets | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 36,848 29,773
Interest rate swap derivative assets | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 0 0
Purchased cash convertible note hedge
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 426,100 460,000
Purchased cash convertible note hedge | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 0 0
Purchased cash convertible note hedge | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 426,100 460,000
Purchased cash convertible note hedge | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 0 0
Foreign exchange derivative liabilities
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 67,816 68,835
Foreign exchange derivative liabilities | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 0 0
Foreign exchange derivative liabilities | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 67,816 68,835
Foreign exchange derivative liabilities | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 0 0
Interest rate swap derivative liabilities
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 4,386 658
Interest rate swap derivative liabilities | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 0 0
Interest rate swap derivative liabilities | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 4,386 658
Interest rate swap derivative liabilities | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 0 0
Cash conversion feature of Cash Convertible Notes
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 426,100 460,000
Cash conversion feature of Cash Convertible Notes | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 0 0
Cash conversion feature of Cash Convertible Notes | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 426,100 460,000
Cash conversion feature of Cash Convertible Notes | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities at fair value 0 0
Contingent consideration
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingent consideration 393,339 376,110
Contingent consideration | Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingent consideration 0 0
Contingent consideration | Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingent consideration 0 0
Contingent consideration | Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingent consideration $ 393,339 $ 376,110
[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.