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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents.","units":{"USD":[{"end":"2013-12-31","val":52171000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1809000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2014Q4I"},{"end":"2015-12-31","val":2168000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2015Q4I"},{"end":"2016-12-31","val":694857000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2016Q4I"}]}},"CashAndCashEquivalentsPeriodIncreaseDecrease":{"label":"Cash and Cash Equivalents, Period Increase (Decrease)","description":"Amount of increase (decrease) in cash and cash equivalents. 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Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or \"\"G&G\"\" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. 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editFacilityCurrentBorrowingCapacity":{"label":"Line 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Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.","units":{"USD":[{"end":"2012-12-31","val":6271000000,"accn":"0001326428-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27","frame":"CY2012Q4I"},{"end":"2013-12-31","val":9395000000,"accn":"0001326428-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27"},{"end":"2013-12-31","val":9395577000,"accn":"0001326428-14-000022","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-01"},{"end":"2013-12-31","val":9395577000,"accn":"0001326428-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07"},{"end":"2013-12-31","val":9395577000,"accn":"0001326428-14-000049","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04"},{"end":"2013-12-31","val":9395577000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2013Q4I"},{"end":"2014-03-31","val":9789248000,"accn":"0001326428-14-000022","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-01","frame":"CY2014Q1I"},{"end":"2014-06-30","val":10009700000,"accn":"0001326428-14-000033","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-07","frame":"CY2014Q2I"},{"end":"2014-09-30","val":12304893000,"accn":"0001326428-14-000049","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q3I"},{"end":"2014-12-31","val":9171824000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"end":"2014-12-31","val":9171824000,"accn":"0001326428-15-000020","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-29"},{"end":"2014-12-31","val":9171824000,"accn":"0001326428-15-000037","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-30"},{"end":"2014-12-31","val":9171824000,"accn":"0001326428-15-000056","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05"},{"end":"2014-12-31","val":9171824000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2014Q4I"},{"end":"2015-03-31","val":9102240000,"accn":"0001326428-15-000020","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-29","frame":"CY2015Q1I"},{"end":"2015-06-30","val":8925425000,"accn":"0001326428-15-000037","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-30","frame":"CY2015Q2I"},{"end":"2015-09-30","val":5588817000,"accn":"0001326428-15-000056","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":5359937000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. 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il 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Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.","units":{"pure":[{"start":"2011-01-01","end":"2011-12-31","val":3,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2011-01-01","end":"2011-12-31","val":3,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy":{"label":"Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy)","description":"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).","units":{"Mcfe":[{"start":"2012-01-01","end":"2012-12-31","val":709000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":527000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"start":"2013-01-01","end":"2013-12-31","val":527000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":250000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":250000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"start":"2014-01-01","end":"2014-12-31","val":250000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":47000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"start":"2015-01-01","end":"2015-12-31","val":47000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23"},{"start":"2015-01-01","end":"2015-12-31","val":47000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":428000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":142000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2017"}]}},"ProvedDevelopedAndUndevelopedReserveNetEnergy":{"label":"Proved Developed and Undeveloped Reserve, Net (Energy)","description":"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).","units":{"Mcfe":[{"end":"2011-12-31","val":3370000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2011Q4I"},{"end":"2012-12-31","val":4796000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"end":"2012-12-31","val":4796000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2012Q4I"},{"end":"2013-12-31","val":6403000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"end":"2013-12-31","val":6403000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"end":"2013-12-31","val":6403000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2013Q4I"},{"end":"2014-12-31","val":7304000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"end":"2014-12-31","val":7304000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"end":"2014-12-31","val":7304000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23"},{"end":"2014-12-31","val":7304000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2014Q4I"},{"end":"2015-12-31","val":4488000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"end":"2015-12-31","val":4488000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23"},{"end":"2015-12-31","val":4488000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2015Q4I"},{"end":"2016-12-31","val":3520000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2016Q4I"},{"end":"2017-12-31","val":1968000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2017Q4I"}]}},"ProvedDevelopedAndUndevelopedReserveNetEnergyPeriodIncreaseDecrease":{"label":"Proved Developed and Undeveloped Reserve, Net (Energy), Period Increase (Decrease)","description":"Energy measure of increase (decrease) of quantity 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).","units":{"Mcfe":[{"start":"2013-01-01","end":"2013-12-31","val":1607000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":901000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"start":"2014-01-01","end":"2014-12-31","val":632000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-2816000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":-85000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23"},{"start":"2016-01-01","end":"2016-12-31","val":-110000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-1382000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2017"}]}},"ProvedDevelopedAndUndevelopedReserveProductionEnergy":{"label":"Proved Developed and Undeveloped Reserve, Production (Energy)","description":"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).","units":{"Mcfe":[{"start":"2012-01-01","end":"2012-12-31","val":246000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":300000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"start":"2013-01-01","end":"2013-12-31","val":300000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":442000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":442000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"start":"2014-01-01","end":"2014-12-31","val":442000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":434000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"start":"2015-01-01","end":"2015-12-31","val":434000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23"},{"start":"2015-01-01","end":"2015-12-31","val":434000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":384000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":239000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2017"}]}},"ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy":{"label":"Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy)","description":"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).","units":{"Mcfe":[{"start":"2012-01-01","end":"2012-12-31","val":1766000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1610000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"start":"2013-01-01","end":"2013-12-31","val":1610000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":2495000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":2495000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"start":"2014-01-01","end":"2014-12-31","val":2495000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2014"}]}},"ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy":{"label":"Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)","description":"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).","units":{"Mcfe":[{"start":"2012-01-01","end":"2012-12-31","val":-803000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":-157000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"start":"2013-01-01","end":"2013-12-31","val":-157000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":-318000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19"},{"start":"2014-01-01","end":"2014-12-31","val":-318000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"start":"2014-01-01","end":"2014-12-31","val":-318000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":-2379000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"start":"2015-01-01","end":"2015-12-31","val":-2379000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23"},{"start":"2015-01-01","end":"2015-12-31","val":-2379000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":-208000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":-78000000,"accn":"0001326428-18-000009","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2017"}]}},"ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions":{"label":"Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions","description":"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.","units":{"pure":[{"start":"2009-01-01","end":"2009-12-31","val":50,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2009-01-01","end":"2009-12-31","val":50,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":234,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2010-01-01","end":"2010-12-31","val":234,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":450,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2011-01-01","end":"2011-12-31","val":450,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesNet":{"label":"Proved Developed and Undeveloped Reserves, Net","description":"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.","units":{"pure":[{"end":"2008-12-31","val":1660,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"end":"2008-12-31","val":1660,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2008Q4I"},{"end":"2009-12-31","val":1712,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"end":"2009-12-31","val":1712,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2009Q4I"},{"end":"2010-12-31","val":2597,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"end":"2010-12-31","val":2597,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2010Q4I"},{"end":"2011-12-31","val":3370,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"end":"2011-12-31","val":3370,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2011Q4I"}]}},"ProvedDevelopedAndUndevelopedReservesProduction":{"label":"Proved Developed and Undeveloped Reserves, Production","description":"Production of proved reserves.","units":{"pure":[{"start":"2009-01-01","end":"2009-12-31","val":-80,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2009-01-01","end":"2009-12-31","val":-80,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-97,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2010-01-01","end":"2010-12-31","val":-97,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":-135,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2011-01-01","end":"2011-12-31","val":-135,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace":{"label":"Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place","description":"Purchase of minerals in place.","units":{"pure":[{"start":"2009-01-01","end":"2009-12-31","val":62,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2009-01-01","end":"2009-12-31","val":62,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":671,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2010-01-01","end":"2010-12-31","val":671,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":579,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2011-01-01","end":"2011-12-31","val":579,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2011"}]}},"ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease":{"label":"Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates","description":"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 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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. 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"0001628280-18-014182","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-13"},{"start":"2018-01-01","end":"2018-12-31","val":0,"accn":"0001326428-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2018"},{"start":"2019-04-01","end":"2019-06-30","val":2318000,"accn":"0001326428-19-000015","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-07"},{"start":"2019-04-01","end":"2019-06-30","val":2318000,"accn":"0001326428-19-000027","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-06","frame":"CY2019Q2"}]}},"StockIssuedDuringPeriodValueOther":{"label":"Stock 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The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":0,"accn":"0001326428-11-000006","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2008"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0001326428-11-000006","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":0,"accn":"0001326428-10-000031","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-29"},{"start":"2010-01-01","end":"2010-09-30","val":0,"accn":"0001326428-10-000041","fy":2010,"fp":"Q3","form":"10-Q/A","filed":"2010-10-29"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0001326428-11-000006","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0001326428-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-21","frame":"CY2010"},{"start":"2011-01-01","end":"2011-09-30","val":0,"accn":"0001326428-11-000040","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001326428-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-21"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001326428-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27","frame":"CY2011"},{"start":"2015-01-01","end":"2015-09-30","val":0,"accn":"0001326428-15-000056","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2016"}]}},"StockRepurchasedDuringPeriodShares":{"label":"Stock Repurchased During Period, Shares","description":"Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.","units":{"shares":[{"start":"2017-06-01","end":"2017-06-30","val":7540,"accn":"0001326428-17-000029","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03","frame":"CY2017Q2I"},{"start":"2018-01-01","end":"2018-03-31","val":897674,"accn":"0001326428-18-000026","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-03","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":1557180,"accn":"0001326428-18-000034","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-08"}]}},"StockRepurchasedDuringPeriodValue":{"label":"Stock Repurchased During Period, Value","description":"Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. 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This element is used when state law does not recognize treasury stock.","units":{"USD":[{"start":"2018-01-01","end":"2018-03-31","val":368214000,"accn":"0001326428-18-000026","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-03","frame":"CY2018Q1"}]}},"StockRepurchaseProgramAuthorizedAmount":{"label":"Stock Repurchase Program, Authorized Amount (Deprecated 2014-01-31)","description":"Amount of a stock repurchase plan authorized by an entity's Board of Directors.","units":{"USD":[{"start":"2008-10-01","end":"2008-10-31","val":100000000,"accn":"0001326428-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27"},{"start":"2008-10-01","end":"2008-10-31","val":100000000,"accn":"0001326428-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-21"},{"start":"2008-10-01","end":"2008-10-31","val":100000000,"accn":"0001326428-12-000065","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-25"},{"start":"2008-01-01","end":"2008-12-31","val":100000000,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2008-01-01","end":"2008-12-31","val":100000000,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2008"}]}},"StockRepurchaseProgramAuthorizedAmount1":{"label":"Stock Repurchase Program, Authorized Amount","description":"Amount of stock repurchase plan authorized.","units":{"USD":[{"end":"2014-12-31","val":250000000,"accn":"0001326428-15-000008","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-19","frame":"CY2014Q4I"},{"end":"2015-12-31","val":250000000,"accn":"0001326428-16-000071","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":250000000,"accn":"0001326428-17-000008","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-23","frame":"CY2016Q4I"},{"end":"2017-06-01","val":75000000,"accn":"0001326428-17-000029","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03"},{"end":"2017-06-28","val":200000000,"accn":"0001326428-17-000029","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-03","frame":"CY2017Q2I"},{"end":"2017-10-04","val":400000000,"accn":"0001326428-18-000026","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-03"},{"end":"2017-10-04","val":400000000,"accn":"0001326428-18-000034","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-08","frame":"CY2017Q3I"}]}},"StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount":{"label":"Stock Repurchase Program, Remaining Authorized Repurchase Amount (Deprecated 2014-01-31)","description":"Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":56000000,"accn":"0001326428-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"start":"2011-01-01","end":"2011-12-31","val":56000000,"accn":"0001193125-12-218922","fy":2011,"fp":"FY","form":"8-K","filed":"2012-05-08","frame":"CY2011"},{"start":"2012-09-29","end":"2012-09-30","val":56000000,"accn":"0001326428-12-000065","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-25"},{"start":"2012-01-01","end":"2012-12-31","val":56000000,"accn":"0001326428-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-21","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":56000000,"accn":"0001326428-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27","frame":"CY2013"}]}},"SubordinatedDebtCurrent":{"label":"Subordinated Debt, Current","description":"The portion of the carrying value of subordinated debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle, if longer. 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