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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation The following is a reconciliation of our liability for plugging and abandonment costs as of December 31, 2020 and 2019 (in thousands):

 

2020

 

 

2019

 

 

Beginning of period

$

251,076

 

 

$

312,754

 

Liabilities incurred

 

1,483

 

 

 

4,063

 

Acquisitions

 

123

 

 

 

—

 

Liabilities settled

 

(4,634

)

 

 

(5,953

)

Disposition of wells

 

(176,748

)

 

 

(82,576

)

Accretion expense

 

7,518

 

 

 

15,658

 

Change in estimate

 

1,004

 

 

 

7,130

 

End of period

 

79,822

 

 

 

251,076

 

 

Less current portion

 

(6,689

)

 

 

(2,393

)

 

Long-term asset retirement obligations

$

73,133

 

 

$

248,683