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Asset Retirement Obligations Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 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 six months ended June 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
243

Liabilities incurred for new wells and facilities construction
26

Reductions due to sold wells and facilities
(6,265
)
Reductions due to plugged wells and facilities
(145
)
Revisions in estimates
(85
)
Asset Retirement Obligations as of June 30, 2018 (2)
$
4,561


(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 $0.3 million of current asset retirement obligations included in “Accounts payable and accrued liabilities” on the accompanying condensed consolidated balance sheets.