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Balance Sheet Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Total available-for-sale securities      
Amortized Cost $ 281,489,000 $ 192,158,000  
Gains in Accumulated Other Comprehensive Income 86,000 76,000  
Losses in Accumulated Other Comprehensive Income (37,000)    
Estimated Fair Value 281,538,000 192,234,000  
Short-term investments, unrealized loss position fair value      
Less than 12 months, fair value 66,722,000    
Total, fair value 66,722,000    
Short-term investments, gross unrealized loss      
Less than 12 months, gross unrealized loss (37,000)    
Total, gross unrealized loss (37,000)    
Proceeds from sales and maturities of available-for-sale securities 499,645,000 244,929,000 707,649,000
Gross realized gains on available-for-sale securities 100,000    
Aggregate unrealized fair value loss which had been in an unrealized loss position for 12 months or longer 0    
Estimated fair value of contractual maturities of available-for-sale securities      
Due in one year or less 196,015,000    
Due in 1-2 years 64,156,000    
Due in 2-3 years 21,367,000    
Total available-for-sale securities 281,538,000 192,234,000  
Maximum
      
Short-term investments, gross unrealized loss      
Less than 12 months, gross unrealized loss (100,000)    
Tax impact on the unrealized gains 100,000    
U.S. treasuries
      
Total available-for-sale securities      
Amortized Cost 130,956,000 184,102,000  
Gains in Accumulated Other Comprehensive Income 22,000 76,000  
Losses in Accumulated Other Comprehensive Income (1,000)    
Estimated Fair Value 130,977,000 184,178,000  
Short-term investments, unrealized loss position fair value      
Less than 12 months, fair value 29,068,000    
Total, fair value 29,068,000    
Short-term investments, gross unrealized loss      
Less than 12 months, gross unrealized loss (1,000)    
Total, gross unrealized loss (1,000)    
Government agency securities
      
Total available-for-sale securities      
Amortized Cost 61,004,000 8,056,000  
Gains in Accumulated Other Comprehensive Income 9,000    
Estimated Fair Value 61,013,000 8,056,000  
Corporate debt
      
Total available-for-sale securities      
Amortized Cost 77,582,000    
Gains in Accumulated Other Comprehensive Income 55,000    
Losses in Accumulated Other Comprehensive Income (36,000)    
Estimated Fair Value 77,601,000    
Short-term investments, unrealized loss position fair value      
Less than 12 months, fair value 37,654,000    
Total, fair value 37,654,000    
Short-term investments, gross unrealized loss      
Less than 12 months, gross unrealized loss (36,000)    
Total, gross unrealized loss (36,000)    
Commercial paper
      
Total available-for-sale securities      
Amortized Cost 11,947,000    
Estimated Fair Value $ 11,947,000