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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
Changes in ARO are as follows:
(in thousands)
Nine Months Ended September 30,
 
2016
2015
Asset Retirement Obligations, Beginning Balance
$
3,612

$
2,839

Liabilities Incurred
—

598

Revision of Estimate
1,224

—

Accretion Expense (1)
151

133

Asset Retirement Obligations, Ending Balance
$
4,987

$
3,570

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