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Decommissioning Liabilities	9 Months Ended
Decommissioning Liabilities	Sep. 30, 2017
Decommissioning Liabilities [Abstract]
Decommissioning Liabilities	(4)Decommissioning Liabilities The Company’s decommissioning liabilities associated with an oil and gas property and its related assets consist of costs related to the plugging of wells, the removal of the related platform and equipment, and site restoration. The Company reviews the adequacy of its decommissioning liabilities whenever indicators suggest that the estimated cash flows needed to satisfy the liabilities have changed materially. The Company had decommissioning liabilities of $128.8 million and $123.7 million at September 30, 2017 and December 31, 2016, respectively.