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Supplemental Information on Oil and Gas Exploration and Productions Activities (Unaudited) - Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities (Details)	12 Months Ended
	Dec. 31, 2015 MBoe MMcf MBbls	Dec. 31, 2014 MBoe MMcf MBbls
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Beginning of period | MBoe	13,607
Revisions of previous estimates | MBoe	(1,244)
Extensions, discoveries and other additions | MBoe	926
Sales of properties | MBoe	(108)
Production | MBoe	(1,663)
End of period | MBoe	11,518
Proved developed reserves | MBoe	11,251	12,221
Proved undeveloped reserves | MBoe	267	1,386
Williston Basin
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
End of period | MBoe	10,063
Proved Undeveloped Reserves | Williston Basin
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Concentration risk, percentage	3.00%
Brp Llc [Member]
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Percentage of partnership interest owned (percent)	51.00%
Crude Oil (MBbl)
Proved Developed and Undeveloped Reserves [Roll Forward]
Begging of period	9,983
Revisions of previous estimates	(1,451)
Extensions, discoveries and other additions	776
Sales of properties	(98)
Production	(1,136)
End of period	8,074
Proved developed reserves	7,862	8,930
Proved undeveloped reserves	212	1,053
NGLs (MBbl)
Proved Developed and Undeveloped Reserves [Roll Forward]
Begging of period	1,229
Revisions of previous estimates	89
Extensions, discoveries and other additions	60
Sales of properties	0
Production	(156)
End of period	1,222
Proved developed reserves	1,196	1,098
Proved undeveloped reserves	26	131
Natural Gas (MMcf)
Proved Developed and Undeveloped Reserves [Roll Forward]
Begging of period | MMcf	14,370
Revisions of previous estimates | MMcf	701
Extensions, discoveries and other additions | MMcf	541
Sales of properties | MMcf	(62)
Production | MMcf	(2,226)
End of period | MMcf	13,324
Proved developed reserves | MMcf	13,157	13,161
Proved undeveloped reserves | MMcf	167	1,209

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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 decrease in quantity of proved reserve of oil and gas resulting from production, 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 (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, 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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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.

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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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Sales of minerals in place.

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Energy measure of interests in proved developed reserves of 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.

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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.

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Energy measure of proved undeveloped reserves of 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.

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Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable 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.

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