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Asset Retirement Obligation (Tables)
 6 Months Ended
Jun. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Changes to the Company's asset retirement obligation liability
The following table describes the changes to the Company’s asset retirement obligation liability (in thousands):
 
Successor
 
Predecessor
 
February 9, 2019 through June 30, 2019
 
January 1, 2019 through February 8, 2019
 
Six Months Ended June 30, 2018
Asset retirement obligation, beginning of period
$
2,486

 
$
2,480

 
$
31,310

Liabilities incurred
20

 
—

 
7

Liabilities settled
(292
)
 
(11
)
 
(98
)
Accretion expense
69

 
17

 
240

Revisions in estimates
1,839

 
—

 
(67
)
Divestiture of oil and gas properties
—

 
—

 
(28,214
)
Asset retirement obligation, end of period
4,122

 
2,486

 
3,178

Less: current portion of asset retirement obligation
(1,525
)
 
(183
)
 
(877
)
Long-term asset retirement obligation
$
2,597

 
$
2,303

 
$
2,301