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Includes other kinds of accounts that have the general characteristics of demand deposits. 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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. 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An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.","units":{"item":[{"start":"2013-01-01","end":"2013-03-31","val":2,"accn":"0001047469-13-005151","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-30","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":2,"accn":"0001047469-13-007893","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-30"}],"Segment":[{"start":"2012-01-01","end":"2012-09-30","val":2,"accn":"0001047469-12-009881","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30"},{"start":"2012-01-01","end":"2012-12-31","val":2,"accn":"0001047469-13-001687","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2012"},{"start":"2013-01-01","end":"2013-09-30","val":2,"accn":"0001047469-13-010040","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-29"}],"segment":[{"start":"2013-01-01","end":"2013-12-31","val":2,"accn":"0001047469-14-001453","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":2,"accn":"0001047469-14-004499","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-01","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":2,"accn":"0001047469-14-006691","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"start":"2014-01-01","end":"2014-09-30","val":2,"accn":"0001047469-14-008788","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04"},{"start":"2014-01-01","end":"2014-12-31","val":2,"accn":"0001047469-15-001039","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-23","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":2,"accn":"0001047469-15-004374","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-05","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":2,"accn":"0001047469-15-006524","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-04"}]}},"NumberOfReportableSegments":{"label":"Number of Reportable Segments","description":"Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.","units":{"segment":[{"start":"2015-01-01","end":"2015-09-30","val":1,"accn":"0001047469-15-008254","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-03"},{"start":"2015-01-01","end":"2015-12-31","val":1,"accn":"0001564590-16-012967","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-22","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":1,"accn":"0001564590-16-017407","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":1,"accn":"0001564590-16-022049","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-02"},{"start":"2016-01-01","end":"2016-09-30","val":1,"accn":"0001564590-16-027473","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04"},{"start":"2016-01-01","end":"2016-12-31","val":1,"accn":"0001564590-17-004239","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":1,"accn":"0001564590-17-009274","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":1,"accn":"0001564590-17-016327","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08"},{"start":"2017-01-01","end":"2017-09-30","val":1,"accn":"0001564590-17-021027","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"start":"2017-01-01","end":"2017-12-31","val":1,"accn":"0001564590-18-004275","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02","frame":"CY2017"}]}},"OilAndCondensateRevenue":{"label":"Oil and Condensate Revenue (Deprecated 2018-01-31)","description":"Revenue from sale of residue oil and condensate, which normally exists in the reservoir as gas but condenses out as a liquid during production.","units":{"USD":[{"start":"2016-01-01","end":"2016-06-30","val":4688000,"accn":"0001564590-16-022049","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-02"},{"start":"2016-04-01","end":"2016-06-30","val":3077000,"accn":"0001564590-16-022049","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-02","frame":"CY2016Q2"}]}},"OilAndGasJointInterestBillingReceivablesCurrent":{"label":"Oil and Gas Joint Interest Billing Receivables, Current","description":"Current portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.","units":{"USD":[{"end":"2011-12-31","val":46700000,"accn":"0001047469-12-005077","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-01"},{"end":"2011-12-31","val":46700000,"accn":"0001047469-12-007582","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31"},{"end":"2011-12-31","val":46700000,"accn":"0001047469-12-009881","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2011Q4I"},{"end":"2012-03-31","val":37100000,"accn":"0001047469-12-005077","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-01","frame":"CY2012Q1I"},{"end":"2012-06-30","val":43800000,"accn":"0001047469-12-007582","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31","frame":"CY2012Q2I"},{"end":"2012-09-30","val":80900000,"accn":"0001047469-12-009881","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3I"},{"end":"2014-12-31","val":13575000,"accn":"0001047469-15-008254","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-03"},{"end":"2014-12-31","val":13575000,"accn":"0001564590-16-012967","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-22","frame":"CY2014Q4I"},{"end":"2015-09-30","val":91666000,"accn":"0001047469-15-008254","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-03","frame":"CY2015Q3I"},{"end":"2015-12-31","val":54709000,"accn":"0001564590-16-012967","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-22"},{"end":"2015-12-31","val":54709000,"accn":"0001564590-16-017407","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03"},{"end":"2015-12-31","val":54709000,"accn":"0001564590-16-022049","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-02"},{"end":"2015-12-31","val":54709000,"accn":"0001564590-16-027473","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04"},{"end":"2015-12-31","val":211308000,"accn":"0001564590-17-004239","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14","frame":"CY2015Q4I"},{"end":"2016-03-31","val":37070000,"accn":"0001564590-16-017407","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03","frame":"CY2016Q1I"},{"end":"2016-06-30","val":48932000,"accn":"0001564590-16-022049","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-02","frame":"CY2016Q2I"},{"end":"2016-09-30","val":43691000,"accn":"0001564590-16-027473","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04","frame":"CY2016Q3I"},{"end":"2016-12-31","val":167573000,"accn":"0001564590-17-004239","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14"},{"end":"2016-12-31","val":167573000,"accn":"0001564590-17-009274","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08"},{"end":"2016-12-31","val":167573000,"accn":"0001564590-17-016327","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08"},{"end":"2016-12-31","val":167573000,"accn":"0001564590-17-021027","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"end":"2016-12-31","val":167573000,"accn":"0001564590-18-004275","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":176402000,"accn":"0001564590-17-009274","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08","frame":"CY2017Q1I"},{"end":"2017-06-30","val":195260000,"accn":"0001564590-17-016327","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08","frame":"CY2017Q2I"},{"end":"2017-09-30","val":186239000,"accn":"0001564590-17-021027","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2017Q3I"},{"end":"2017-12-31","val":176320000,"accn":"0001564590-18-004275","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02","frame":"CY2017Q4I"}]}},"OilAndGasProductionExpense":{"label":"Oil 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"end":"2016-09-30","val":4282000,"accn":"0001564590-16-027473","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04","frame":"CY2016Q3I"},{"end":"2016-12-31","val":3902000,"accn":"0001564590-17-004239","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-14"},{"end":"2016-12-31","val":3902000,"accn":"0001564590-17-009274","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08"},{"end":"2016-12-31","val":3902000,"accn":"0001564590-17-016327","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08"},{"end":"2016-12-31","val":3902000,"accn":"0001564590-17-021027","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02"},{"end":"2016-12-31","val":3902000,"accn":"0001564590-18-004275","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":3540000,"accn":"0001564590-17-009274","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08","frame":"CY2017Q1I"},{"end":"2017-06-30","val":3185000,"accn":"0001564590-17-016327","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-08","frame":"CY2017Q2I"},{"end":"2017-09-30","val":2837000,"accn":"0001564590-17-021027","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-02","frame":"CY2017Q3I"},{"end":"2017-12-31","val":2502000,"accn":"0001564590-18-004275","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02","frame":"CY2017Q4I"}]}},"PropertyPlantAndEquipmentOther":{"label":"Property, 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Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. 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This does not include the amounts capitalized as part of the cost of the utility plant or 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