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Asset Retirement Obligations Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Roll-forward of our asset retirement obligations
The following provides a roll-forward of our asset retirement obligations for the year ended December 31, 2017 and the nine months ended September 30, 2018 (in thousands):

Asset Retirement Obligations as of December 31, 2016
$
32,256

Accretion expense
2,322

Liabilities incurred for new wells and facilities construction
253

Reductions due to sold wells and facilities
(21,466
)
Reductions due to plugged wells and facilities
(2,366
)
Revisions in estimates
(212
)
Asset Retirement Obligations as of December 31, 2017 (1)
$
10,787

Accretion expense
330

Liabilities incurred for new wells and facilities construction
46

Reductions due to sold wells and facilities
(6,298
)
Reductions due to plugged wells and facilities
(155
)
Revisions in estimates
(82
)
Asset Retirement Obligations as of September 30, 2018 (2)
$
4,628


(1) Includes approximately $2.1 million of current asset retirement obligations included in “Accounts payable and accrued liabilities” on the accompanying condensed consolidated balance sheets.
(2) Includes approximately $0.5 million of current asset retirement obligations included in “Accounts payable and accrued liabilities” on the accompanying condensed consolidated balance sheets.