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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Financial assets subject to fair value measurements and the necessary disclosures    
Total available-for-sale securities $ 322,621 $ 270,921
Money market funds    
Financial assets subject to fair value measurements and the necessary disclosures    
Total available-for-sale securities 175,972 124,938
Corporate notes, bonds and commercial paper    
Financial assets subject to fair value measurements and the necessary disclosures    
Total available-for-sale securities 146,649 145,983
Recurring basis    
Financial assets subject to fair value measurements and the necessary disclosures    
Total available-for-sale securities 322,621 270,921
Recurring basis | Money market funds    
Financial assets subject to fair value measurements and the necessary disclosures    
Total available-for-sale securities 175,972 124,938
Recurring basis | Corporate notes, bonds and commercial paper    
Financial assets subject to fair value measurements and the necessary disclosures    
Total available-for-sale securities 146,649 145,983
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 175,972 124,938
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 175,972 124,938
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 146,649 145,983
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 146,649 145,983
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