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Reconciliation of Asset Retirement Obligation Liability (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation [Abstract]  
Schedule of change in asset retirement obligation liability [Table Text Block]
A reconciliation of the Company’s total asset retirement obligation liability is as follows:
 
As of December 31,
 
2019
 
2018
 
(in thousands)
Beginning asset retirement obligations
$
94,194

 
$
114,470

Liabilities incurred (1)
3,927

 
4,054

Liabilities settled (2)
(4,105
)
 
(33,024
)
Accretion expense
4,016

 
4,438

Revision to estimated cash flows
(11,186
)
 
4,256

Ending asset retirement obligations (3)
$
86,846

 
$
94,194

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(1) 
Reflects liabilities incurred through drilling activities and acquisitions of drilled wells.
(2) 
Reflects liabilities settled through plugging and abandonment activities and divestitures of properties.
(3) 
Balances as of December 31, 2019, and 2018, included $2.7 million and $2.3 million, respectively, related to the Company’s current asset retirement obligation liability, which is recorded in the accounts payable and accrued expenses line item on the accompanying balance sheets.