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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2012
item
Dec. 31, 2011
Investments    
Amortized Cost, Long-term Equity Securities $ 625 $ 625
Estimated Fair Value, Long-term Equity Securities 625 625
Amortized Cost, Investments 260,942 280,939
Unrealized Gains 2,893 719
Unrealized Losses (130) (684)
Other-Than-Temporary Impairment Loss (880) (880)
Estimated Fair Value, Investments 262,825 280,094
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 27  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 49,604  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (130)  
Short-term investments
   
Investments    
Amortized Cost, Debt Securities 258,738 278,776
Unrealized Gains 402 95
Unrealized Losses (130) (684)
Estimated Fair Value 259,010 278,187
Short-term investments | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 164,160 182,059
Unrealized Gains 159 55
Unrealized Losses (7) (263)
Estimated Fair Value 164,312 181,851
Short-term investments | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 94,578 96,717
Unrealized Gains 243 40
Unrealized Losses (123) (421)
Estimated Fair Value 94,698 96,336
Corporate debt securities
   
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 24  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 37,348  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (44)  
Corporate debt securities | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 135,045 109,842
Unrealized Gains 146 13
Unrealized Losses (7) (255)
Estimated Fair Value 135,184 109,600
Corporate debt securities | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 55,374 57,632
Unrealized Gains 127 21
Unrealized Losses (37) (331)
Estimated Fair Value 55,464 57,322
Debt securities issued by U.S. government agencies
   
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 2  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 7,056  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (83)  
Debt securities issued by U.S. government agencies | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities 18,015 53,723
Unrealized Gains 6 35
Unrealized Losses   (5)
Estimated Fair Value 18,021 53,753
Debt securities issued by U.S. government agencies | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 13,177 26,754
Unrealized Gains 36  
Unrealized Losses (83) (67)
Estimated Fair Value 13,130 26,687
Debt securities issued by the U.S. Treasury | Debt maturities of one year or less
   
Investments    
Amortized Cost, Debt Securities   2,353
Unrealized Gains   3
Estimated Fair Value   2,356
Debt securities issued by the U.S. Treasury | Debt maturities of more than one year
   
Investments    
Amortized Cost, Debt Securities 13,455  
Unrealized Gains 31  
Estimated Fair Value 13,486  
Debt securities issued by states of the United States and political subdivisions of the states
   
Temporarily impaired investments    
Temporarily impaired securities, Number of Investments 1  
Temporarily impaired securities, Less than 12 months of temporary impairment, Estimated Fair Value 5,200  
Total temporarily impaired securities, less than 12 months of temporary impairment, Unrealized Losses (3)  
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 11,100 16,141
Unrealized Gains 7 4
Unrealized Losses   (3)
Estimated Fair Value 11,107 16,142
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 12,572 12,331
Unrealized Gains 49 19
Unrealized Losses (3) (23)
Estimated Fair Value 12,618 12,327
Equity securities
   
Investments    
Amortized Cost, Investments 2,204 2,163
Unrealized Gains 2,491 624
Other-Than-Temporary Impairment Loss (880) (880)
Estimated Fair Value, Investments 3,185 1,907
Current portion of equity securities
   
Investments    
Amortized Cost, Equity Securities 1,579 1,538
Unrealized Gains 2,491 624
Other-Than-Temporary Impairment Loss (880) (880)
Estimated Fair Value $ 3,190 $ 1,282