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Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
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 $ 241,472 $ 359,097
Amortized Cost 241,527 359,112
Gross Unrealized Gains 3 0
Gross Unrealized Losses (58) (15)
Cash, fair value 29,654 28,565
Cash, amortized cost 29,654 28,565
Cash, cash equivalents and marketable securities    
Fair Value 271,126 387,662
Amortized Cost 271,181 387,677
Gross Unrealized Gains 3 0
Gross Unrealized Losses (58) (15)
Money market funds
    
Cash equivalents and marketable securities    
Fair Value 96,032 300,605
Amortized Cost 96,032 300,605
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 145,440 58,492
Amortized Cost 145,495 58,507
Gross Unrealized Gains 3 0
Gross Unrealized Losses $ (58) $ (15)
Weighted Rate of Return (as a percent) 0.20% 0.15%