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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019
 
Year Ended December 31, 2018
(In thousands)
 
 
 
Balance at beginning of period (including current portion)
$
243,417

 
$
328,695

Accretion expense
20,548

 
27,970

Obligations of divested operations
(12,185
)
 
—

Adjustments to the liability from changes in estimates
11,438

 
(100,728
)
Liabilities settled
(10,420
)
 
(12,520
)
Balance at period end
$
252,798

 
$
243,417

Current portion included in accrued expenses
(10,366
)
 
(13,113
)
Noncurrent liability
$
242,432

 
$
230,304