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Asset Retirement Obligations - Schedule of Changes in Asset Retirement Obligations (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
Balance at December 31, 2015 $ 35,812
Liabilities incurred during period 465
Liabilities settled during period (444) [1]
Accretion expense during period 1,425 [2]
Revisions to estimates 571
Balance at September 30, 2016 $ 37,829
[1] Liabilities settled during the nine months ended September 30, 2016 included ARO related to the sold properties (see Note 7 – Divestiture).
[2] Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statement of Operations.