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Q1","form":"10-Q","filed":"2015-11-13"},{"end":"2015-06-30","val":1000,"accn":"0001144204-16-081969","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-02-16"},{"end":"2015-06-30","val":1000,"accn":"0001144204-16-102037","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-05-16","frame":"CY2015Q2I"},{"end":"2015-09-30","val":1000,"accn":"0001144204-15-065083","fy":2016,"fp":"Q1","form":"10-Q","filed":"2015-11-13","frame":"CY2015Q3I"},{"end":"2015-12-31","val":1000,"accn":"0001144204-16-081969","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":1000,"accn":"0001144204-16-102037","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-05-16","frame":"CY2016Q1I"}]}},"CommonStockValue":{"label":"Common 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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.","units":{"USD":[{"end":"2010-12-31","val":40000,"accn":"0001193125-12-104001","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-08","frame":"CY2010Q4I"},{"end":"2010-12-31","val":40000,"accn":"0001193125-11-294658","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03"},{"end":"2010-12-31","val":40000,"accn":"0001193125-11-207908","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-03"},{"end":"2011-06-30","val":40000,"accn":"0001193125-11-207908","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-03","frame":"CY2011Q2I"},{"end":"2011-09-30","val":40000,"accn":"0001193125-11-294658","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03","frame":"CY2011Q3I"},{"end":"2011-12-31","val":40000,"accn":"0001193125-12-331251","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-02"},{"end":"2011-12-31","val":40000,"accn":"0001193125-12-207513","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-03"},{"end":"2011-12-31","val":40000,"accn":"0001193125-12-104001","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-08"},{"end":"2011-12-31","val":40000,"accn":"0000750199-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07","frame":"CY2011Q4I"},{"end":"2011-12-31","val":40000,"accn":"0000750199-12-000006","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-01"},{"end":"2012-03-31","val":40000,"accn":"0001193125-12-207513","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-03","frame":"CY2012Q1I"},{"end":"2012-06-30","val":40000,"accn":"0001193125-12-331251","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-02","frame":"CY2012Q2I"},{"end":"2012-09-30","val":40000,"accn":"0000750199-12-000006","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-01","frame":"CY2012Q3I"},{"end":"2012-12-31","val":40000,"accn":"0000750199-14-000021","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2012Q4I"},{"end":"2012-12-31","val":40000,"accn":"0000750199-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-31"},{"end":"2012-12-31","val":40000,"accn":"0000750199-13-000032","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-01"},{"end":"2012-12-31","val":40000,"accn":"0000750199-13-000014","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-02"},{"end":"2012-12-31","val":40000,"accn":"0000750199-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"end":"2013-03-31","val":40000,"accn":"0000750199-13-000014","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-02","frame":"CY2013Q1I"},{"end":"2013-06-30","val":40000,"accn":"0000750199-13-000032","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-01","frame":"CY2013Q2I"},{"end":"2013-09-30","val":40000,"accn":"0000750199-13-000037","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-31","frame":"CY2013Q3I"},{"end":"2013-12-31","val":41000,"accn":"0000750199-14-000026","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2013Q4I"},{"end":"2013-12-31","val":41000,"accn":"0000750199-14-000021","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28"},{"end":"2014-03-31","val":41000,"accn":"0000750199-14-000026","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1I"}]}},"ComprehensiveIncomeNetOfTax":{"label":"Comprehensive Income (Loss), Net of Tax, Attributable to Parent","description":"Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. 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This element excludes replacement reserves which are an escrow separately provided for within the US GAAP 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Expense","description":"\"Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. 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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