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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of changes in Company's asset retirement obligations
The following table summarizes the changes in the Company’s asset retirement obligations for the years ended December 31, 2019 and 2018 (in thousands). 
 
 
Year Ended December 31,
 
 
2019
 
2018
Beginning asset retirement obligations
 
$
31,086

 
$
26,256

Liabilities incurred during period
 
3,811

 
3,566

Liabilities settled during period
 
(155
)
 
(708
)
Revisions in estimated cash flows
 
1,792

 
442

Divestitures during the period
 
(2,145
)
 
—

Accretion expense
 
1,822

 
1,530

Ending asset retirement obligations
 
36,211

 
31,086

Less: current asset retirement obligations(1)
 
(619
)
 
(1,350
)
Long-term asset retirement obligations
 
$
35,592

 
$
29,736


__________________
(1)
Included in “Accrued liabilities” in the Company’s consolidated balance sheets at December 31, 2019 and 2018.