Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Changes in Discounted Future Net Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Revisions of previous estimates | |||
Changes in prices | $ 2,172,704 | $ (2,498,616) | $ 422,080 |
Revisions in quantities | 513,168 | 88,190 | 326,240 |
Changes in future development costs | (275,468) | (354,766) | (346,378) |
Accretion of discount | 395,989 | 608,381 | 464,735 |
Net change in income taxes | (1,299,227) | 832,830 | (400,690) |
Purchases of reserves in place | |||
Additions to proved reserves from extensions, discoveries and improved recovery | 1,981,054 | 1,429,340 | 2,169,706 |
Production | (1,286,103) | (976,224) | (911,873) |
Development costs incurred during the period | 462,862 | 562,329 | 513,551 |
Sales of natural gas and oil | (162,463) | (120,637) | (1,313,401) |
Timing and other | 135,910 | (861,919) | 111,801 |
Net change for the year | 2,638,426 | (1,291,092) | 1,035,771 |
Beginning of year | 3,223,805 | 4,514,897 | 3,479,126 |
End of year | $ 5,862,231 | $ 3,223,805 | $ 4,514,897 |
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- Definition
Net change for the year. No definition available.
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- Definition
Amount of (increase) decrease in standardized measure of discounted future net cash flow as a result of sales and transfers of oil and gas produced. No definition available.
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- Details
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- Definition
Timing and other. No definition available.
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in estimated future development costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of increase in standardized measure of discounted future net cash flow as a result of purchases of minerals in place. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in sales and transfer prices and in production (lifting) costs related to future production. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of (increase) decrease in standardized measure of discounted future net cash flow as a result of previously estimated development costs incurred. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of revisions of estimated quantity of oil and gas in proved reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Revenue derived from sale of oil and gas exploratory and developmental prospects. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of standardized measure of discounted future net cash flow relating to proved oil and gas reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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