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Supplemental Natural Gas Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2015
Oil And Gas Exploration And Production Industries Disclosures [Abstract] |
Summary of Estimated Quantities of Proved Natural Gas Reserves | Estimated quantities of proved natural gas reserves are summarized as follows:
|  | Proved |  |  | Proved |
|  | Developed |  |  | Undeveloped |
|  | Reserves |  |  | Reserves |
|  | Natural |  |  | Natural |
|  | Gas (MMcf) |  |  | Gas (MMcf) |
Year-end 2014 |  |  | 27,000 |  |  |  | 32,193 |
Revisions of previous estimates |  |  | 1,549 |  |  |  | (24,097 | )
Production |  |  | (3,742 | ) |  |  | — |
Year-end 2015 |  |  | 24,807 |  |  |  | 8,096 |
Estimates of Future Cash Flows from Proved Natural Gas Reserves | Estimates of future cash flows from proved natural gas reserves are shown in the following table. Estimated income taxes are calculated by applying the appropriate tax rates to the estimated future pre-tax net cash flows less depreciation of the tax basis of properties and the statutory depletion allowance.
|  | 2015 |
|  | (In thousands) |
Future cash inflows |  | $ | 32,476 |
Future production and development costs |  |  | (11,345 | )
Future income tax expenses |  |  | — |
Future net cash flows |  |  | 21,131 |
10% annual discount for estimated timing of cash flows |  |  | (9,069 | )
Standardized measure of discounted future net cash flows |  |  | 12,062 |
Changes in Standardized Measure of Discounted Future Net Cash Flow | Changes in the standardized measure of discounted future net cash flow follows:
|  | For the Year |
|  | 2015 |
|  | (In thousands) |
Net change in sales prices and production costs |  | $ | (49,562 | )
Net change in future development costs |  |  | 15,563 |
Sales of natural gas, net of production costs |  |  | (10,088 | )
Net change due to revisions of quantity estimates |  |  | (9,705 | )
Accretion of discount |  |  | (6,346 | )
Net change in income taxes |  |  | 14,207 |
Other |  |  | 3,818 |
Aggregate change for the year |  | $ | (42,113 | )

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- Definition Tabular disclosure of the aggregate change in the standardized measure of discounted future net cash flows relating to proved oil and gas reserves and oil and gas subject to purchases under long-term agreements in which the enterprise participates in the operation of the properties on which oil and gas is located or otherwise serves as the producer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 36 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62536-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62496-109447 + Details
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- Definition Tabular disclosure of the net quantities of an enterprise's interests in proved developed and undeveloped reserves of (a) crude oil (including condensate and natural gas liquids), (b) natural gas (including coal bed methane), (c) synthetic oil, (d) synthetic gas, and (e) other nonrenewable natural resources that are intended to be upgraded during the period as of the beginning of the period, changes in quantities during the period, and as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61858-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61884-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61797-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61869-109447 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61872-109447 + Details
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- Definition Tabular disclosure of the future net cash flows relating to proved oil and gas reserves and oil and gas subject to purchase under long-term agreements in which the enterprise participates in the operation of the properties on which the oil and gas is located or otherwise serves as the producer. This information is presented in aggregate and for each geographic area for which reserve quantities are disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62424-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62476-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 36 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62536-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62455-109447 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62479-109447 + Details
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