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Fair Value Measurements (Tables)
9 Months Ended
Sep. 28, 2018
Fair Value Disclosures [Abstract]  
Classification of Financial Assets Measured and Recorded at Fair Value on a Recurring Basis
The classification of our financial assets within the fair value hierarchy that were measured and recorded at fair value on a recurring basis was as follows; the amounts presented exclude cash, but include investments classified as cash equivalents (in thousands):
 
September 30, 2018
 
Level 1
 
Level 2
 
Total
Money market funds
$
62,325

 
$

 
$
62,325

Certificates of deposit

 
19,098

 
19,098

Commercial paper

 
355,720

 
355,720

Corporate bonds

 
261,594

 
261,594

U.S. Treasury and government sponsored enterprises

 
50,564

 
50,564

Total financial assets
$
62,325

 
$
686,976

 
$
749,301

 
December 31, 2017
 
Level 1
 
Level 2
 
Total
Money market funds
$
45,478

 
$

 
$
45,478

Commercial paper

 
199,647

 
199,647

Corporate bonds

 
179,022

 
179,022

U.S. Treasury and government sponsored enterprises

 
16,263

 
16,263

Total financial assets
$
45,478

 
$
394,932

 
$
440,410