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Supplemental Information on Oil and Natural Gas Producing Activities - Summary of Changes in Estimated Oil and Natural Gas Reserves (Unaudited) (Details) Mcf in Thousands | 12 Months Ended |
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Dec. 31, 2015 MBbls Mcf | Dec. 31, 2014 MBbls Mcf | Dec. 31, 2013 MBbls Mcf | Dec. 31, 2012 MBbls Mcf
Oil Reserves |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |
Proved developed and undeveloped reserves, beginning balance | 126,031 | 142,641 | 262,045 |
Revisions of previous estimates | (70,708) | (18,687) | (13,969) |
Acquisitions of new reserves | 22,447 | 1,009 | 43 |
Extensions and discoveries | 9,741 | 37,603 | 40,570 |
Sales of reserves in place |  | (25,659) | (131,769) |
Production | (9,600) | (10,876) | (14,279) |
Proved developed and undeveloped reserves, ending balance | 77,911 | 126,031 | 142,641 |
Proved developed reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | 48,639 | 79,022 | 83,893 | 136,605
Proved undeveloped reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | 29,272 | 47,009 | 58,748 | 125,440
Natural Gas Liquids |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |
Proved developed and undeveloped reserves, beginning balance | 91,786 | 59,052 | 67,994 |
Revisions of previous estimates | (37,384) | 11,103 | 3,717 |
Acquisitions of new reserves | 2,460 | 441 | 13 |
Extensions and discoveries | 9,257 | 27,500 | 18,686 |
Sales of reserves in place |  | (2,516) | (29,067) |
Production | (5,044) | (3,794) | (2,291) |
Proved developed and undeveloped reserves, ending balance | 61,075 | 91,786 | 59,052 |
Proved developed reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | 51,089 | 56,823 | 35,807 | 33,785
Proved undeveloped reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | 9,986 | 34,963 | 23,245 | 34,209
Natural Gas |  |  |  |
Proved Developed and Undeveloped Reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) |  |  |  |
Proved developed and undeveloped reserves, beginning balance | Mcf | 1,788,233 | 1,390,429 | 1,415,042 |
Revisions of previous estimates | Mcf | (759,106) | 167,589 | (53,432) |
Acquisitions of new reserves | Mcf | 15,952 | 12,527 | 363 |
Extensions and discoveries | Mcf | 160,865 | 467,185 | 359,918 |
Sales of reserves in place | Mcf |  | (163,800) | (228,229) |
Production | Mcf | (92,104) | (85,697) | (103,233) |
Proved developed and undeveloped reserves, ending balance | Mcf | 1,113,840 | 1,788,233 | 1,390,429 |
Proved developed reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | Mcf | 964,617 | 1,203,447 | 951,609 | 896,701
Proved undeveloped reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | Mcf | 149,223 | 584,786 | 438,820 | 518,341

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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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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 + Details
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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(2)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 + Details
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- Definition Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61831-109447 + Details
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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic 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 9 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e61884-109447 Reference 2: 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 + Details
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