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Fair Value Measurements (Tables)
 6 Months Ended
Jul. 01, 2017
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured at Fair Value
Assets measured at fair value as of July 1, 2017 were as follows (in thousands):
 
 
 
Fair value as of measurement date
 
Quoted prices in active markets for identical assets
(Level 1)
 
Significant other observable inputs
(Level 2)
 
Significant unobservable inputs
(Level 3)
Government securities
 
$
6,588

 
$
—

 
$
6,588

 
$
—

Corporate bonds
 
$
5,840

 
$
—

 
$
5,840

 
$
—

Derivative financial instruments
 
$
2,106

 
$
—

 
$
2,106

 
$
—


Assets measured at fair value as of December 31, 2016 were as follows (in thousands):
 
 
 
Fair value as of measurement date
 
Quoted prices in active markets for identical assets
(Level 1)
 
Significant other observable inputs
(Level 2)
 
Significant unobservable inputs
(Level 3)
Government securities
 
$
6,268

 
$
—

 
$
6,268

 
$
—

Corporate bonds
 
$
6,017

 
$
—

 
$
6,017

 
$
—

Derivative financial instruments
 
$
2,309

 
$
—

 
$
2,309

 
$
—