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Accrued Liabilities (Tables)
9 Months Ended
Sep. 30, 2022
Accrued Liabilities  
Schedule of accrued liabilities

Accrued liabilities consisted of the following items:

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(Unaudited)

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December 31,

​

September 30,

​

(in thousands)

    

2021

    

2022

 

Capital expenditures

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$

24,900

​

​

19,465

​

Operating expenses

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​

10,417

​

​

8,716

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Interest expense

​

​

36,794

​

​

39,831

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Ad valorem taxes

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​

5,400

​

​

2,265

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Other

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​

3,327

​

​

2,675

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Total accrued liabilities

​

$

80,838

​

​

72,952

​