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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities $ 241,472   $ 359,097
Investment in non-marketable equity securities      
Impairment of investment in non-marketable equity security 600 1,400  
Money market funds
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 96,032   300,605
Corporate notes, bonds and commercial paper
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 145,440   58,492
Recurring basis | Total
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 241,472   359,097
Recurring basis | Total | Money market funds
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 96,032   300,605
Recurring basis | Total | Corporate notes, bonds and commercial paper
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 145,440   58,492
Recurring basis | Quoted Market Prices in Active Markets (Level 1)
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 96,032   300,605
Recurring basis | Quoted Market Prices in Active Markets (Level 1) | Money market funds
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 96,032   300,605
Recurring basis | Quoted Market Prices in Active Markets (Level 1) | Corporate notes, bonds and commercial paper
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 0   0
Recurring basis | Significant Other Observable Inputs (Level 2)
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 145,440   58,492
Recurring basis | Significant Other Observable Inputs (Level 2) | Money market funds
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 0   0
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate notes, bonds and commercial paper
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 145,440   58,492
Recurring basis | Significant Unobservable Inputs (Level 3)
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 0   0
Recurring basis | Significant Unobservable Inputs (Level 3) | Money market funds
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 0   0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate notes, bonds and commercial paper
      
Financial assets subject to fair value measurements and the necessary disclosures      
Total available-for-sale securities 0   0
Nonrecurring basis
      
Investment in non-marketable equity securities      
Carrying Value 0    
Impairment of investment in non-marketable equity security 600    
Nonrecurring basis | Quoted Market Prices in Active Markets (Level 1)
      
Investment in non-marketable equity securities      
Fair Value 0    
Nonrecurring basis | Significant Other Observable Inputs (Level 2)
      
Investment in non-marketable equity securities      
Fair Value 0    
Nonrecurring basis | Significant Unobservable Inputs (Level 3)
      
Investment in non-marketable equity securities      
Fair Value $ 0