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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2014
Cash and Cash Equivalents [Abstract]  
Summary of cash, cash equivalents and marketable securities
A summary of the Company’s cash, cash equivalents and marketable securities is shown below:
 
Amortized Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
(in thousands)
December 31, 2014
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
625,259

 
$
—

 
$
—

 
$
625,259

Total cash and cash equivalents
$
625,259

 
$
—

 
$
—

 
$
625,259

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities (due within 1 year)
$
463,788

 
$
14

 
$
(52
)
 
$
463,750

Commercial paper (due within 1 year)
51,674

 
72

 
—

 
51,746

Corporate debt securities (due within 1 year)
196,065

 
2

 
(66
)
 
196,001

Corporate debt securities (due after 1 year through 5 years)
50,443

 
—

 
(93
)
 
50,350

Total marketable securities
$
761,970

 
$
88

 
$
(211
)
 
$
761,847

Total cash, cash equivalents and marketable securities
$
1,387,229

 
$
88

 
$
(211
)
 
$
1,387,106

 
 
 
 
 
 
 
 
December 31, 2013
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
569,299

 
$
—

 
$
—

 
$
569,299

Total cash and cash equivalents
$
569,299

 
$
—

 
$
—

 
$
569,299

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities (due within 1 year)
$
600,496

 
$
7

 
$
(53
)
 
$
600,450

Commercial paper (due within 1 year)
83,384

 
109

 
—

 
83,493

Corporate debt securities (due within 1 year)
189,674

 
14

 
(34
)
 
189,654

Corporate debt securities (due after 1 year through 5 years)
22,181

 
6

 
(7
)
 
22,180

Total marketable securities
$
895,735

 
$
136

 
$
(94
)
 
$
895,777

Total cash, cash equivalents and marketable securities
$
1,465,034

 
$
136

 
$
(94
)
 
$
1,465,076