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Marketable Investments (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Continuous unrealized loss position, Fair Value    
Fair Value, Total $ 85,973 $ 319,401
Continuous unrealized loss position, Gross Unrealized Loss    
Gross Unrealized Loss, Total (52) (612)
Government-sponsored enterprises
   
Continuous unrealized loss position, Fair Value    
Continuous unrealized loss position less than one year, Fair value 53,646 170,018
Fair Value, Total 53,646 170,018
Continuous unrealized loss position, Gross Unrealized Loss    
Continuous unrealized loss position less than one year, Gross Unrealized Loss (32) (170)
Gross Unrealized Loss, Total (32) (170)
Corporate notes and bonds
   
Continuous unrealized loss position, Fair Value    
Continuous unrealized loss position less than one year, Fair value 32,327 149,383
Fair Value, Total 32,327 149,383
Continuous unrealized loss position, Gross Unrealized Loss    
Continuous unrealized loss position less than one year, Gross Unrealized Loss (20) (442)
Gross Unrealized Loss, Total $ (20) $ (442)