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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Cash equivalents and marketable securities    
Maximum maturity period of available-for-sale securities (in years) 3 years 3 years
Maximum remaining maturity period of available-for-sale securities (in years) 1 year 1 year
Fair Value $ 353,607 $ 183,915
Amortized Cost 353,617 183,926
Gross Unrealized Gains 0 4
Gross Unrealized Losses (10) (15)
Cash, fair value 12,750 19,415
Cash, amortized cost 12,750 19,415
Cash, cash equivalents and marketable securities    
Fair Value 366,357 203,330
Amortized Cost 366,367 203,341
Gross Unrealized Gain 0 4
Gross Unrealized Losses (10) (15)
Money market funds
   
Cash equivalents and marketable securities    
Fair Value 295,211 126,570
Amortized Cost 295,211 126,570
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Weighted Rate of Return (as a percent) 0.01% 0.01%
Corporate notes, bonds and commercial paper
   
Cash equivalents and marketable securities    
Fair Value 58,396 57,345
Amortized Cost 58,406 57,356
Gross Unrealized Gains 0 4
Gross Unrealized Losses (10) (15)
Weighted Rate of Return (as a percent) 0.14% 0.17%
Cash equivalents and marketable securities, Continuous unrealized loss position    
Less than one year, Fair Value 50,369 51,819
Unrealized gain (loss), Gross    
Less than one year, Gross Unrealized Loss (10) (15)
Cash equivalents
   
Cash equivalents and marketable securities    
Fair Value 295,211 129,569
Short term marketable securities
   
Cash equivalents and marketable securities    
Fair Value $ 58,396 $ 54,346