Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2018

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

Changes in asset retirement obligations are as follows:

(in thousands)	Three Months Ended March 31, 2018
Asset Retirement Obligations, Beginning Balance	$	10,416
Liabilities Incurred	1,241
Accretion Expense (1)	134
Asset Retirement Obligations, Ending Balance	$	11,791

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