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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation Changes in AROs are as follows:
 
Year Ended December 31,
(in thousands)
2018
 
2017
Asset Retirement Obligations, Beginning Balance
$
10,416

 
$
5,415

Liabilities Incurred
5,582

 
4,828

Revision of Estimate
662

 
(151
)
Accretion Expense (1)
670

 
324

Asset Retirement Obligations, Ending Balance
$
17,330

 
$
10,416

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