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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2022
Fair Value Measurements  
Schedule of fair value hierarchy

The carrying values of our assets and liabilities that are required to be measured at fair value on a recurring basis as of September 30, 2022 and December 31, 2021 are classified in the table below in one of the three categories of the fair value hierarchy described above (in thousands):

    

Fair Value Measurements

    

Level 1

    

Level 2

    

Level 3

    

Total

September 30, 2022

 

  

 

  

 

  

 

  

Assets:

 

  

 

  

 

  

 

  

Money market mutual fund

$

1,856

$

$

$

1,856

Mutual funds

 

98,747

98,747

U.S. Treasury notes

 

201,390

201,390

Corporate debt securities

198,664

198,664

$

500,657

$

$

$

500,657

Fair Value Measurements 

    

Level 1

    

Level 2

    

Level 3

    

Total

December 31, 2021

Assets:

 

  

 

  

 

  

 

  

Money market mutual fund

$

111,313

$

$

$

111,313

Mutual funds

 

110,006

 

 

 

110,006

U.S. Treasury notes

223,896

223,896

Corporate debt securities

 

155,796

 

 

 

155,796

$

601,011

$

$

$

601,011

Schedule of estimated fair values and the carrying values

The following table presents the estimated fair values and the carrying values (in thousands):

    

September 30, 2022

December 31, 2021

    

Carrying Value

    

Fair Value

    

Carrying Value

    

Fair Value

2026 Senior Notes

$

392,009

$

278,266

$

390,523

$

331,783

2025 Senior Notes

$

14,062

$

12,131

$

13,648

$

13,628