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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of changes in asset retirement obligations
The following table summarizes the changes in the Company’s asset retirement obligations:
 
December 31,
 
2018
 
2017
 
(In thousands)
Asset retirement obligations:
 

 
 

Beginning asset retirement obligations
$
66,595

 
$
63,574

Additions associated with the acquisition of DGE
74,482

 
—

Liabilities incurred during period
5,311

 
—

Liabilities settled during period
(3,345
)
 
—

Revisions in estimated retirement obligations
—

 
(3,945
)
Accretion expense
8,910

 
6,966

Ending asset retirement obligations
$
151,953

 
$
66,595