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Supplemental Information on Oil and Natural Gas Producing Activities - Narrative (Details) Mcf in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) MMBoe MBbls Mcf | Dec. 31, 2014 USD ($) MMBoe MBbls Mcf | Dec. 31, 2013 USD ($) MMBoe MBbls Mcf | Dec. 31, 2012 USD ($)
Reserve Quantities [Line Items] |  |  |  |
Percentage of proved reserves estimated by the Company | 9.90% |  |  |
Expected period without drilling activity |  | 5 years |  |
Acquisitions of new reserves (MMBoe) | MMBoe |  | 3.5 |  |
Standardized measure of discounted future net cash flows | $ | $ 1,314,562 | $ 4,087,752 | $ 4,017,611 | $ 5,840,368
Oil Reserves |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Extensions and discoveries (in MBbls for Oil and NGLs/Mcf for Natural Gas) | 9,741 | 37,603 | 40,570 |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) | 70,708 | 18,687 | 13,969 |
Natural Gas Reserves |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Extensions and discoveries (in MBbls for Oil and NGLs/Mcf for Natural Gas) | Mcf | 160,865 | 467,185 | 359,918 |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) | Mcf | 759,106 | (167,589) | 53,432 |
Natural Gas Liquids |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Extensions and discoveries (in MBbls for Oil and NGLs/Mcf for Natural Gas) | 9,257 | 27,500 | 18,686 |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) | 37,384 | (11,103) | (3,717) |
Gulf Properties |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Sale of reserves in place (MMBoe) | MMBoe |  | 55.5 |  |
Permian Properties |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Proved reserves (in MMBoe) | MMBoe |  |  | 198.9 |
Proved developed reserves as a percentage of total proved reserves |  |  | 55.00% |
Standardized measure of discounted future net cash flows | $ |  |  | $ 2,500,000 |
Lower Commodity Price | Oil Reserves |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) | 54,000 |  |  |
Lower Commodity Price | Natural Gas Reserves |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) | Mcf | 687,000 |  |  |
Lower Commodity Price | Natural Gas Liquids |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) | 36,000 |  |  |
North Park Basin, Jackson County, Colorado [Member] |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Acquisitions of new reserves (MMBoe) | MMBoe | 27.6 |  |  |
Mid-Continent and Permian Basin | Oil Reserves |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) |  | 2,000 |  |
Mid-Continent |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Extensions and discoveries (in MMBoe) | MMBoe |  |  | 119.2 |
Mid-Continent | Oil Reserves |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Extensions and discoveries (in MBbls for Oil and NGLs/Mcf for Natural Gas) | 9,700 |  |  |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) | 16,000 | 8,000 |  |
Mid-Continent | Natural Gas Reserves |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Extensions and discoveries (in MBbls for Oil and NGLs/Mcf for Natural Gas) | Mcf | 160,900 |  |  |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) | Mcf | 74,000 |  |  |
Mid-Continent | Natural Gas Liquids |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Extensions and discoveries (in MBbls for Oil and NGLs/Mcf for Natural Gas) | 9,300 |  |  |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) | 1,000 |  |  |
Permian Properties | Oil Reserves |  |  |  |
Reserve Quantities [Line Items] |  |  |  |
Revisions of previous estimates (in MBbls for Oil and NGLs/Mcf for Natural Gas) |  | 9,000 |  |

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