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Percentage of total proved reserves estimated by the Company.

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Proved Developed Reserves as a Percentage of Total Proved Reserves

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Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
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Energy measure of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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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.

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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.

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Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of discounted future accumulated cash inflow relating to proved oil and gas reserves.

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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