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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017 (in thousands). 
 
 
Year Ended December 31,
 
 
2018
 
2017
Beginning asset retirement obligations
 
$
26,256

 
$
20,640

Liabilities incurred during period
 
3,566

 
2,920

Liabilities settled during period
 
(708
)
 
(430
)
Revisions in estimated cash flows
 
442

 
1,836

Accretion expense
 
1,530

 
1,290

Ending asset retirement obligations
 
31,086

 
26,256

Less: current asset retirement obligations (1)
 
(1,350
)
 
(1,176
)
Long-term asset retirement obligations
 
$
29,736

 
$
25,080


__________________
(1)
Included in accrued liabilities in the Company’s consolidated balance sheets at December 31, 2018 and 2017.