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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
Changes in asset retirement obligations are as follows:
 
Six Months Ended June 30,
(in thousands)
2017
 
2016
Asset Retirement Obligations, Beginning Balance
$
5,415

 
$
3,612

Liabilities Incurred
1,566

 
—

Revision of Estimate
—

 
1,224

Accretion Expense (1)
143

 
87

Asset Retirement Obligations, Ending Balance
$
7,124

 
$
4,923

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