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Asset Retirement Obligations Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Roll-forward of our asset retirement obligations
The following provides a roll-forward of our asset retirement obligations (in thousands):
Asset Retirement Obligations as of December 31, 2017
$
10,787

Accretion expense
419

Liabilities incurred for new wells and facilities construction
93

Reductions due to sold wells and facilities
(6,298
)
Reductions due to plugged wells and facilities
(180
)
Revisions in estimates
(562
)
Asset Retirement Obligations as of December 31, 2018
$
4,259

Accretion expense
329

Liabilities incurred for new wells and facilities construction
250

Reductions due to sold wells and facilities
—

Reductions due to plugged wells and facilities
(82
)
Revisions in estimates
(309
)
Asset Retirement Obligations as of December 31, 2019
$
4,447