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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2024
Fair Value Measurements  
Summary of Financial Assets and Liabilities Accounted for at Fair Value

June 30, 2024

    

Total

    

Level 1

    

Level 2

    

Level 3

(In thousands)

Assets:

 

  

 

  

 

  

 

  

Investments in marketable securities

$

35,583

$

17,328

$

18,255

$

Fund for asset retirement obligations

146,010

146,010

Total assets

$

181,593

$

163,338

$

18,255

$

December 31, 2023

    

Total

    

Level 1

    

Level 2

    

Level 3

(In thousands)

Assets:

    

  

    

  

    

  

    

  

Investments in marketable securities

$

32,724

$

28,773

$

3,951

$

Fund for asset retirement obligations

142,266

142,266

Total assets

$

174,990

$

171,039

$

3,951

$