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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Measurements  
Schedule of fair value hierarchy

The carrying values of our assets that are required to be measured at fair value on a recurring basis as of December 31, 2021 and 2020 approximate fair value because of our ability to immediately convert these instruments into cash with minimal expected change in value which 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

December 31, 2021

 

  

 

  

 

  

 

  

Cash equivalents:

 

  

 

  

 

  

 

  

Money market mutual fund

$

111,313

$

$

$

111,313

Marketable equity securities:

 

  

 

  

 

  

 

  

Mutual funds

 

110,006

 

 

 

110,006

Available-for-sale debt securities:

 

 

  

 

  

 

U.S. Treasury notes

 

223,896

 

 

 

223,896

Corporate debt securities

155,796

155,796

$

601,011

$

$

$

601,011

Fair Value Measurements 

    

Level 1

    

Level 2

    

Level 3

    

Total

December 31, 2020

Cash equivalents:

 

  

 

  

 

  

 

  

Money market mutual fund

$

11,820

$

$

$

11,820

Marketable equity securities:

 

  

 

  

 

  

 

  

Mutual funds

 

33,135

 

 

 

33,135

Available-for-sale debt securities:

 

  

 

  

 

  

 

  

U.S. Treasury notes

 

23,309

 

 

 

23,309

$

68,264

$

$

$

68,264

Schedule of estimated fair values and the carrying values

    

December 31, 2021

December 31, 2020

    

Carrying Value

    

Fair Value

    

Carrying Value

    

Fair Value

2026 Senior Notes

$

390,523

$

331,783

$

$

2025 Senior Notes

$

13,648

$

13,628

$

111,344

$

108,210