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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 28, 2014
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Financial Instruments
 
Fair value measurements as of
June 28, 2014
 
Fair value measurements as of
 December 28, 2013
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
Short-term marketable securities
$
109,061

 
$
109,061

 
$

 
$

 
$
101,505

 
$
101,505

 
$

 
$

Long-term marketable securities

 

 

 

 
5,241

 

 

 
5,241

Foreign currency forward exchange contracts
(50
)
 

 
(50
)
 

 
48

 

 
48

 

Total fair value of financial instruments
$
109,011

 
$
109,061

 
$
(50
)
 
$

 
$
106,794

 
$
101,505

 
$
48

 
$
5,241

Schedule of Changes In Level 3 Instruments
During the six months ended June 28, 2014 and June 29, 2013, the following changes occurred in our Level 3 instruments (in thousands):

 
Six Months Ended
 
June 28,
2014
 
June 29,
2013
Beginning fair value of Long-term marketable securities
$
5,241

 
$
4,717

Fair value of securities sold
(5,488
)
 

Realized gain from increase in fair value
247

 

Ending fair value of Long-term marketable securities
$

 
$
4,717