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Supplemental Information on Oil and Gas Exploration and Productions Activities (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows Oil and Gas (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Principal Sources of Change in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Abstract]  
Beginning of the period $ 305,197
Changes in prices and costs (188,946)
Changes in quantities (11,750)
Changes in future development costs (12,202)
Previously estimated development costs incurred during the period 29,080
Additions to proved reserves from extensions, discoveries and improved recovery, less related costs 11,928
Purchases and sales of reserves in place, net (3,851)
Accretion of discount 31,795
Sales of oil and gas, net of production costs (35,112)
Production timing and other (9,786)
Net increase (decrease) (188,844)
End of period $ 116,353