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Marketable Securities
 12 Months Ended
Dec. 31, 2015
Cash and Cash Equivalents [Abstract]  
Marketable Securities
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, 2015
 
 
 
 
 
 
 
Cash and cash equivalents:
 
 
 
 
 
 
 
Cash and money market funds
$
582,352

 
$
—

 
$
—

 
$
582,352

Government-sponsored enterprise securities
85,994

 
—

 
—

 
85,994

Commercial paper
34,889

 
—

 
—

 
34,889

Corporate debt securities
11,533

 
—

 
—

 
11,533

Total cash and cash equivalents
$
714,768

 
$
—

 
$
—

 
$
714,768

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities (due within 1 year)
$
87,176

 
$
—

 
$
(14
)
 
$
87,162

Commercial paper (due within 1 year)
98,877

 
246

 
—

 
99,123

Corporate debt securities (due within 1 year)
141,515

 
—

 
(106
)
 
141,409

Total marketable securities
327,568

 
246

 
(120
)
 
327,694

Total cash, cash equivalents and marketable securities
$
1,042,336

 
$
246

 
$
(120
)
 
$
1,042,462

 
 
 
 
 
 
 
 
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


The Company has a limited number of marketable securities in insignificant loss positions as of December 31, 2015, which the Company does not intend to sell and has concluded it will not be required to sell before recovery of the amortized costs for the investment at maturity. There were no charges recorded for other-than-temporary declines in fair value of marketable securities nor gross realized gains or losses recognized in 2015, 2014 or 2013.