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UNAUDITED SUPPLEMENTAL OIL AND GAS INFORMATION (Details 3) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward] |  |  |
Standardized measure, beginning of year | $ 81,889 | $ 104,853 | $ 71,017
Sales of oil and gas, net of production costs | (2,944) | (21,741) | (23,178)
Net changes in prices and production costs | (96,586) | (17,376) | 2,543
Changes in estimated future development costs | 51,998 | (1,869) | (6,414)
Extensions and discoveries | $ 2,260 | 14,706 | $ 54,360
Sale of minerals in place |  | (13,339) |
Revisions in previous quantity estimates | $ (27,693) | (4,815) | $ (2,961)
Previously estimated development costs incurred |  | 7,175 | 8,344
Net changes in income taxes | $ 3,306 | 6,924 | (4,245)
Accretion of discount | 8,189 | 10,090 | 7,647
Changes in timing and other | (2,651) | (2,719) | (2,260)
Standardized measure, end of year | $ 17,768 | $ 81,889 | $ 104,853

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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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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves. + 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 (d) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in the estimated future income tax on future pretax net cash flows related to the entity's proved oil and gas reserves. + 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 (j) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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