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Asset Retirement Obligation
 3 Months Ended
Mar. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Asset Retirement Obligation

The following table describes the changes to the Company’s asset retirement obligation liability (in thousands):
 
Successor
 
Predecessor
 
February 9 through March 31,
 
January 1 through February 8,
 
Three Months Ended March 31,
 
2019
 
2019
 
2018
Asset retirement obligation, beginning of period
$
2,486

 
$
2,480

 
$
31,310

Liabilities incurred
—

 
—

 
7

Liabilities settled
(50
)
 
(11
)
 
(57
)
Accretion expense
23

 
17

 
198

Revisions in estimates
785

 
—

 
(2
)
Divestiture of oil and gas properties
—

 
—

 
(28,214
)
Asset retirement obligation, end of period
3,244

 
2,486

 
3,242

Less: current portion of asset retirement obligation
(723
)
 
(183
)
 
(938
)
Long-term asset retirement obligation
$
2,521

 
$
2,303

 
$
2,304



Revisions in estimates for the period February 9, 2019 through March 31, 2019 are primarily due to the change in timing and scope of plugging and abandonment operations at one of the Company's Gulf Coast wells. The divestiture of oil and gas properties during 2018 totaling $28.2 million relates to the sale of the Company's Gulf of Mexico assets. The liabilities incurred, revisions in estimated cash flows and divestitures represent non-cash investing activities for purposes of the consolidated statement of cash flows.