Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2018

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

Changes in asset retirement obligations are as follows:

(in thousands)	Nine Months Ended September 30, 2018
Asset Retirement Obligations, Beginning Balance	$	10,416
Liabilities Incurred	4,878
Accretion Expense (1)	476
Asset Retirement Obligations, Ending Balance	$	15,770

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