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Fair Value Measurements
6 Months Ended
Jun. 30, 2023
Fair Value Measurements [Abstract]  
Fair Value Measurements
8.  Fair Value Measurements


The following tables present the major security types we held at June 30, 2023 and December 31, 2022 that we regularly measure and carry at fair value. The following tables segregate each security type by the level within the fair value hierarchy of the valuation techniques we utilized to determine the respective security’s fair value (in thousands):

 
At
June 30, 2023
   
Quoted Prices in
Active Markets
(Level 1)
   
Significant Other
Observable Inputs
(Level 2)
 
Cash equivalents (1)
 
$
316,359
   
$
316,359
   
$
 
Corporate debt securities (2)
   
816,361
     
     
816,361
 
Debt securities issued by U.S. government agencies (3)
   
318,966
     
     
318,966
 
Debt securities issued by the U.S. Treasury (4)
   
809,112
     
809,112
     
 
Debt securities issued by states of the U.S. and political subdivisions of the states (4)
   
53,792
     
     
53,792
 
Publicly traded equity securities included in other current assets (5)
   
8,222
     
8,222
     
 
Total
 
$
2,322,812
   
$
1,133,693
   
$
1,189,119
 

 
At
December 31, 2022
   
Quoted Prices in
Active Markets
(Level 1)
   
Significant Other
Observable Inputs
(Level 2)
 
Cash equivalents (1)
 
$
211,655
   
$
211,655
   
$
 
Corporate debt securities (6)
   
726,950
     
     
726,950
 
Debt securities issued by U.S. government agencies (4)
   
165,055
     
     
165,055
 
Debt securities issued by the U.S. Treasury (4)
   
748,475
     
748,475
     
 
Debt securities issued by states of the U.S. and political subdivisions of the states (4)
   
74,917
     
     
74,917
 
Other municipal debt securities (4)
   
5,994
     
     
5,994
 
Publicly traded equity securities included in other current assets (5)
   
10,539
     
10,539
     
 
Total
 
$
1,943,585
   
$
970,669
   
$
972,916
 

The following footnotes reference lines in our condensed consolidated balance sheets:

(1)
Included in cash and cash equivalents in our condensed consolidated balance sheets.

(2)
$33.7 million was included in cash and cash equivalents, with the difference included in short-term investments, in our condensed consolidated balance sheets.

(3)
$4.0 million was included in cash and cash equivalents, with the difference included in short-term investments, in our condensed consolidated balance sheets.

(4)
Included in short-term investments in our condensed consolidated balance sheets.

(5)
Included in other current assets in our condensed consolidated balance sheets.

(6)
$11.0 million was included in cash and cash equivalents, with the difference included in short-term investments, in our condensed consolidated balance sheets.

Convertible Notes


Our 1.75% Notes, 0% Notes and 0.125% Notes had a fair value of $576.3 million, $599.8 million and $107.5 million at June 30, 2023, respectively. Our 0% Notes and 0.125% Notes had a fair value of $587.3 million and $498.9 million at December 31, 2022, respectively. We determine the fair value of our notes based on quoted market prices for these notes, which are Level 2 measurements because the notes do not trade regularly.