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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Cash equivalents and marketable securities    
Maximum maturity period of available-for-sale securities (in years) 3 years  
Maximum remaining maturity period of available-for-sale securities (in years) 1 year  
Fair Value $ 175,394 $ 264,667
Amortized Cost 175,414 264,767
Gross Unrealized Losses (20) (100)
Cash, fair value 31,692 24,789
Cash 31,692 24,789
Cash, cash equivalents and marketable securities    
Fair Value 207,086 289,456
Amortized Cost 207,106 289,556
Gross Unrealized Losses (20) (100)
Money market funds
   
Cash equivalents and marketable securities    
Fair Value 118,508 127,559
Amortized Cost 118,508 127,559
Weighted Rate of Return (as a percent) 0.01% 0.01%
Corporate notes, bonds and commercial paper
   
Cash equivalents and marketable securities    
Fair Value 56,886 137,108
Amortized Cost 56,906 137,208
Gross Unrealized Losses (20) (100)
Weighted Rate of Return (as a percent) 0.21% 0.29%
Cash equivalents and marketable securities, Continuous unrealized loss position    
Less than one year, Fair Value 46,384 137,107
Unrealized gain (loss), Gross    
Less than one year, Gross Unrealized Loss (20) (100)
Cash equivalents
   
Cash equivalents and marketable securities    
Fair Value 120,514 137,455
Short term marketable securities
   
Cash equivalents and marketable securities    
Fair Value $ 54,880 $ 127,212