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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Financial assets subject to fair value measurements (excluding restricted cash and cash equivalents (VIE))
The following table sets forth the Company’s financial assets (excluding VIE cash and cash equivalents) subject to fair value measurements:
 
Fair Value Measurements as
of December 31, 2014
 
 
 
Fair Value Hierarchy
 
Total
 
Level 1
 
Level 2
 
Level 3
 
(in thousands)
Financial assets carried at fair value:
 
 
 
 
 
 
 
Cash equivalents:
 
 
 
 
 
 
 
Money market funds
$
290,531

 
$
290,531

 
$
—

 
$
—

Marketable securities:
 
 
 
 
 
 
 
Government-sponsored enterprise securities
463,750

 
463,750

 
—

 
—

Commercial paper
51,746

 
—

 
51,746

 
—

Corporate debt securities
246,351

 
—

 
246,351

 
—

Prepaid and other current assets:
 
 
 
 
 
 
 
Foreign currency forward contracts
2,011

 
—

 
2,011

 
—

Total
$
1,054,389

 
$
754,281

 
$
300,108

 
$
—