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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation Changes in AROs are as follows:
 
Year Ended December 31,
(in thousands)
2019
 
2018
Asset Retirement Obligations, Beginning Balance
$
30,533

 
$
23,022

Liabilities Incurred
1,912

 
5,590

Liabilities Settled
(131
)
 
(44
)
Revision of Estimate
3,686

 
646

Accretion Expense (1)
1,842

 
1,319

Asset Retirement Obligations, Ending Balance
$
37,842

 
$
30,533

(1) 
Accretion expense is included in depreciation and amortization expense in the consolidated statements of operations.