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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
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:
 
Year Ended December 31, 2018
 
Year Ended December 31, 2017
(In thousands)
 
 
 
Balance at beginning of period (including current portion)
$
328,695

 
$
356,742

Accretion expense
27,970

 
30,209

Obligations of divested operations
—

 
(12,569
)
Adjustments to the liability from changes in estimates
(100,728
)
 
(23,215
)
Liabilities settled
(12,520
)
 
(22,472
)
Fresh start accounting adjustment
—

 
—

Balance at period end
$
243,417

 
$
328,695

Current portion included in accrued expenses
(13,113
)
 
(19,840
)
Noncurrent liability
$
230,304

 
$
308,855