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Fair Value Measurements (Tables)
9 Months Ended
Sep. 27, 2019
Fair Value Disclosures [Abstract]  
Classification of Financial Assets Measured and Recorded at Fair Value on a Recurring Basis
The classifications within the fair value hierarchy of our financial assets that were measured and recorded at fair value on a recurring basis were as follows (in thousands):
 
September 30, 2019
 
Level 1
 
Level 2
 
Total
Money market funds
$
26,641

 
$

 
$
26,641

Commercial paper

 
332,239

 
332,239

Corporate bonds

 
706,807

 
706,807

U.S. Treasury and government sponsored enterprises

 
152,650

 
152,650

Total investments available-for-sale
26,641

 
1,191,696

 
1,218,337

Certificates of deposit

 
29,192

 
29,192

Total financial assets carried at fair value
$
26,641

 
$
1,220,888

 
$
1,247,529

 
December 31, 2018
 
Level 1
 
Level 2
 
Total
Money market funds
$
47,744

 
$

 
$
47,744

Commercial paper

 
381,133

 
381,133

Corporate bonds

 
344,064

 
344,064

U.S. Treasury and government sponsored enterprises

 
55,201

 
55,201

Total investments available-for-sale
47,744

 
780,398

 
828,142

Certificates of deposit

 
16,596

 
16,596

Total financial assets carried at fair value
$
47,744

 
$
796,994

 
$
844,738