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

September 30, 2023

    

Total

    

Level 1

    

Level 2

    

Level 3

(In thousands)

Assets:

 

  

 

  

 

  

 

  

Investments in marketable securities

$

30,447

$

26,469

$

3,978

$

Derivatives

 

1,281

 

 

46

 

1,235

Fund for asset retirement obligations

140,413

140,413

Total assets

$

172,141

$

166,882

$

4,024

$

1,235

Liabilities:

 

 

 

 

Derivatives

$

$

$

$

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

Three Months Ended September 30, 2023

Nine Months Ended September 30, 2023

(In thousands)

Balance, beginning of period

$

230

$

1,300

Realized and unrealized gains (losses) recognized in earnings, net

 

1,341

 

(1,037)

Purchases

 

 

1,800

Settlements

 

(336)

 

(828)

Ending balance

$

1,235

$

1,235