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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2015 (in thousands):
 
Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
 
Significant Other
Observable
Inputs (Level 2)
Unobservable Inputs (Level 3)
Assets:
 
 
 
 
Money market instruments
$
6,024

 
$
—

$
—

Corporate bonds
—

 
230,951

—

Treasury bills
—

 
153,797

—

Asset-backed securities
—

 
86,576

—

Euro liquidity fund
—

 
47,730

—

Sovereign bonds
—

 
34,943

—

Agency bonds
—

 
9,158

—

Municipal bonds
—

 
5,459

—

Cash flow hedge forward contracts
—

 
441

—

Economic hedge forward contracts
—

 
9

—

Liabilities:
 
 
 
 
Cash flow hedge forward contracts
—

 
(201
)
—

Economic hedge forward contracts
—

 
(43
)
—

Contingent consideration liability (Note 20)
—

 
—

(3,000
)