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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
security
Dec. 31, 2012
Investments    
Amortized Cost, Long-term Equity Securities $ 625 $ 625
Estimated Fair Value, Long-term Equity Securities 625 625
Amortized Cost, Investments 281,899 267,569
Unrealized Gains 31,597 22,581
Unrealized Losses (248) (185)
Other-Than-Temporary Impairment Loss (880) (880)
Estimated Fair Value, Investments 312,368 289,085
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 77  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 114,028  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (248)  
Short-term investments
   
Investments    
Amortized Cost, Debt Securities 264,211 249,839
Unrealized Gains 298 310
Unrealized Losses (248) (185)
Estimated Fair Value 264,261 249,964
Short-term investments | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 124,464 140,909
Unrealized Gains 116 102
Unrealized Losses (86) (77)
Estimated Fair Value 124,494 140,934
Short-term investments | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 139,747 108,930
Unrealized Gains 182 208
Unrealized Losses (162) (108)
Estimated Fair Value 139,767 109,030
Corporate debt securities
   
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 70  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 95,606  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (185)  
Corporate debt securities | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 97,983 113,249
Unrealized Gains 59 81
Unrealized Losses (29) (9)
Estimated Fair Value 98,013 113,321
Corporate debt securities | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 107,131 80,166
Unrealized Gains 110 112
Unrealized Losses (156) (92)
Estimated Fair Value 107,085 80,186
Debt securities issued by U.S. government agencies
   
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 4  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 13,885  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (49)  
Debt securities issued by U.S. government agencies | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 9,932 10,100
Unrealized Gains 1 2
Unrealized Losses (46) (66)
Estimated Fair Value 9,887 10,036
Debt securities issued by U.S. government agencies | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 15,020 8,034
Unrealized Gains 35 38
Unrealized Losses (3)  
Estimated Fair Value 15,052 8,072
Debt securities issued by the U.S. Treasury | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 1,000 1,000
Unrealized Gains 1 1
Estimated Fair Value 1,001 1,001
Debt securities issued by the U.S. Treasury | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 12,393 12,424
Unrealized Gains 30 27
Estimated Fair Value 12,423 12,451
Debt securities issued by states of the United States and political subdivisions of the states
   
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 3  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 4,537  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (14)  
Debt securities issued by states of the United States and political subdivisions of the states | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 15,549 16,560
Unrealized Gains 55 18
Unrealized Losses (11) (2)
Estimated Fair Value 15,593 16,576
Debt securities issued by states of the United States and political subdivisions of the states | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 5,203 8,306
Unrealized Gains 7 31
Unrealized Losses (3) (16)
Estimated Fair Value 5,207 8,321
Equity securities
   
Investments    
Amortized Cost, Investments 17,688 17,730
Unrealized Gains 31,299 22,271
Other-Than-Temporary Impairment Loss (880) (880)
Estimated Fair Value, Investments 48,107 39,121
Equity securities | Other current assets
   
Investments    
Amortized Cost, Equity Securities 1,538 1,579
Unrealized Gains 1,961 4,175
Other-Than-Temporary Impairment Loss (880) (880)
Estimated Fair Value 2,619 4,874
Equity securities | Regulus Therapeutics
   
Investments    
Amortized Cost, Equity Securities 15,525 15,526
Unrealized Gains 29,338 18,096
Estimated Fair Value $ 44,863 $ 33,622