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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation [Abstract]  
Schedule of Change in Asset Retirement Obligation
The following table describes the changes to the Company’s asset retirement obligation liability:
 
Successor
Predecessor
 
Year Ended December 31, 2017
 
October 2 through December 31, 2016
January 1 through October 1, 2016
(In thousands)
 
 
 
 
Balance at beginning of period (including current portion)
$
356,742

 
$
354,326

$
410,454

Accretion expense
30,209

 
7,634

24,321

Obligations of divested operations
(12,569
)
 
—

(14,702
)
Adjustments to the liability from changes in estimates
(23,215
)
 
—

3,003

Liabilities settled
(22,472
)
 
(5,218
)
(11,087
)
Fresh start accounting adjustment
—

 
—

(57,663
)
Balance at period end
$
328,695

 
$
356,742

$
354,326

Current portion included in accrued expenses
(19,840
)
 
(19,515
)
(17,290
)
Noncurrent liability
$
308,855

 
$
337,227

$
337,036