XML 69 R58.htm IDEA: XBRL DOCUMENT v3.21.2
Asset Retirement Obligations - Asset Retirement Obligations (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Asset Retirement Obligation [Abstract]    
Beginning of period $ 79,822 $ 251,076
Liabilities incurred 60 1,483
Acquisitions 0 123
Liabilities settled (2,985) (4,634)
Disposition of wells 0 (176,748)
Accretion expense 2,639 7,518
Change in estimate 2,118 1,004
End of period 81,654 79,822
Less current portion (6,689) (6,689)
Long-term asset retirement obligations $ 74,965 $ 73,133