Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017
Asset Retirement Obligations, Beginning Balance	$	5,415
Liabilities Incurred	1,566
Accretion Expense (1)	234
Asset Retirement Obligations, Ending Balance	$	7,215

⁽¹⁾  Accretion expense is included in depreciation and amortizationexpense in the consolidated statements ofoperations.