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Marketable Securities (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
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 $ 322,621 $ 270,921
Amortized Cost 322,707 271,034
Gross Unrealized Gains 2 1
Gross Unrealized Losses (88) (114)
Cash, fair value 25,505 29,188
Cash, amortized cost 25,505 29,188
Cash, cash equivalents and marketable securities    
Fair Value 348,126 300,109
Amortized Cost 348,212 300,222
Gross Unrealized Gains 2 1
Gross Unrealized Losses (88) (114)
Money market funds    
Cash equivalents and marketable securities    
Fair Value 175,972 124,938
Amortized Cost 175,972 124,938
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 $ 146,649 $ 145,983
Amortized Cost 146,735 146,096
Gross Unrealized Gains 2 1
Gross Unrealized Losses $ (88) $ (114)
Weighted Rate of Return (as a percent) 0.40% 0.25%