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Asset Retirement Obligation (Tables)
12 Months Ended
Dec. 31, 2021
Asset Retirement Obligations  
Schedule of asset retirement obligation

    

December 31, 

    

December 31, 

    

2021

    

2020

    

(in thousands)

Asset retirement obligation – balance at beginning of period

$

3,844

$

2,486

Changes in estimate

 

794

 

1,159

Payments

(220)

Accretion

 

307

 

199

Asset retirement obligation – balance at end of period

$

4,725

$

3,844