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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2023
Fair Value Measurements  
Summary of Financial Assets and Liabilities Accounted for at Fair Value

June 30, 2023

    

Total

    

Level 1

    

Level 2

    

Level 3

(In thousands)

Assets:

 

  

 

  

 

  

 

  

Investments in marketable securities

$

33,607

$

28,645

$

4,962

$

Derivatives

 

230

 

 

 

230

Fund for asset retirement obligations

138,657

138,657

Total assets

$

172,494

$

167,302

$

4,962

$

230

Liabilities:

 

 

 

 

Derivatives

$

$

$

$

Summary of Change in the Fair Values of Financial Instruments Categorized as Level 3

Three Months Ended June 30, 2023

Six Months Ended June 30, 2023

(In thousands)

Balance, beginning of period

$

1,101

$

1,300

Realized and unrealized (losses) recognized in earnings, net

 

(1,096)

 

(2,378)

Purchases

 

225

 

1,800

Settlements

 

 

(492)

Ending balance

$

230

$

230