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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Summary of Available-for-Sale Securities Measured at Fair Value
The following table summarizes our financial assets and liabilities carried at fair value, all of which were valued using inputs based upon quoted prices for similar instruments in active markets (known as "Level 2" inputs in the fair value hierarchy established by the Financial Accounting Standards Board ("FASB") Topic Fair Value Measurements and Disclosures).
(in thousands)
June 30, 2016
 
December 31, 2015
Available-for-sale securities
 
 
 
Commercial paper
$
8,012

 
$
3,996

Certificates of deposit
1,000

 
—

Mutual funds
1,118

 
1,093

Total fair value of available-for-sale securities
$
10,130

 
$
5,089

 
 
 
 
Derivatives
 
 
 
Forward contracts outstanding to purchase or sell foreign currencies
$
5,034

 
$
2,186