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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Investments    
Amortized Cost, Long-term Equity Securities $ 625 $ 625
Estimated Fair Value, Long-term Equity Securities 625 625
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 98  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 185,216  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (744)  
Available-for-sale securities:
   
Investments    
Amortized Cost, Debt Securities 305,276 253,839
Unrealized Gains 166 310
Unrealized Losses (744) (185)
Estimated Fair Value 304,698 253,964
Available-for-sale securities: | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 174,944 144,909
Unrealized Gains 99 102
Unrealized Losses (173) (77)
Estimated Fair Value 174,870 144,934
Available-for-sale securities: | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 130,332 108,930
Unrealized Gains 67 208
Unrealized Losses (571) (108)
Estimated Fair Value 129,828 109,030
Corporate debt securities
   
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 85  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 152,051  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (634)  
Corporate debt securities | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 134,045 115,249
Unrealized Gains 60 81
Unrealized Losses (88) (9)
Estimated Fair Value 134,017 115,321
Corporate debt securities | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 103,219 80,166
Unrealized Gains 23 112
Unrealized Losses (546) (92)
Estimated Fair Value 102,696 80,186
Debt securities issued by U.S. government agencies
   
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 7  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 25,342  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (88)  
Debt securities issued by U.S. government agencies | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 23,887 12,100
Unrealized Gains   2
Unrealized Losses (85) (66)
Estimated Fair Value 23,802 12,036
Debt securities issued by U.S. government agencies | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 10,002 8,034
Unrealized Gains 25 38
Unrealized Losses (3)  
Estimated Fair Value 10,024 8,072
Debt securities issued by the U.S. Treasury | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 5,023 1,000
Unrealized Gains 4 1
Estimated Fair Value 5,027 1,001
Debt securities issued by the U.S. Treasury | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 8,340 12,424
Unrealized Gains 14 27
Estimated Fair Value 8,354 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 6  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 7,823  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (22)  
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 11,989 16,560
Unrealized Gains 35 18
Unrealized Losses   (2)
Estimated Fair Value 12,024 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 8,771 8,306
Unrealized Gains 5 31
Unrealized Losses (22) (16)
Estimated Fair Value 8,754 8,321
Equity securities
   
Investments    
Amortized Cost, Investments 17,688 17,730
Unrealized Gains 47,441 22,271
Other-Than-Temporary Impairment Loss (880) (880)
Estimated Fair Value, Investments 64,249 39,121
Equity securities | Other current assets
   
Investments    
Amortized Cost, Equity Securities 1,538 1,579
Unrealized Gains 776 4,175
Other-Than-Temporary Impairment Loss (880) (880)
Estimated Fair Value 1,434 4,874
Equity securities | Regulus Therapeutics Inc.
   
Investments    
Amortized Cost, Equity Securities 15,525 15,526
Unrealized Gains 46,665 18,096
Estimated Fair Value $ 62,190 $ 33,622