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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
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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

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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