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Includes only common stock transactions (excludes preferred stock transactions). 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capitalized costs incurred during the period (excluded from amortization) 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: 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. Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells.\"","units":{"USD":[{"start":"2012-04-01","end":"2012-06-30","val":82800000,"accn":"0001193125-12-341205","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07","frame":"CY2012Q2"}]}},"ExplorationCostsCumulative":{"label":"Exploration Costs, Cumulative","description":"\"The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, 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: 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. Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test 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of Loan Costs","description":"The cash outflow for loan origination associated cost which is usually collected through 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Does not include preferred shares that have been repurchased.","units":{"shares":[{"end":"2010-12-31","val":0,"accn":"0001193125-12-081879","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27","frame":"CY2010Q4I"},{"end":"2011-12-31","val":0,"accn":"0001193125-12-081879","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-27"},{"end":"2011-12-31","val":0,"accn":"0001193125-13-075479","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0,"accn":"0001193125-13-075479","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26"},{"end":"2012-12-31","val":0,"accn":"0001193125-14-065181","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0,"accn":"0001193125-14-065181","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-24"},{"end":"2013-12-31","val":0,"accn":"0001564590-15-000844","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0,"accn":"0001564590-15-000844","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-24","frame":"CY2014Q4I"}]}},"PreferredStockValue":{"label":"Preferred Stock, Value, Issued","description":"Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.","units":{"USD":[{"end":"2013-12-31","val":0,"accn":"0001193125-14-293756","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-04"},{"end":"2013-12-31","val":0,"accn":"0001564590-14-004889","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-03","frame":"CY2013Q4I"},{"end":"2014-06-30","val":0,"accn":"0001193125-14-293756","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-04","frame":"CY2014Q2I"},{"end":"2014-09-30","val":0,"accn":"0001564590-14-004889","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-03","frame":"CY2014Q3I"}]}},"PrepaidExpenseCurrent":{"label":"Prepaid Expense, Current","description":"Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if 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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.","units":{"cubicFeet":[{"end":"2010-12-31","val":479.3,"accn":"0001193125-11-298793","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07","frame":"CY2010Q4I"},{"end":"2010-12-31","val":479.3,"accn":"0001193125-11-226378","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-08-18"},{"end":"2011-06-30","val":969.8,"accn":"0001193125-11-298793","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07","frame":"CY2011Q2I"},{"end":"2011-06-30","val":969.8,"accn":"0001193125-11-226378","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-08-18"}]}},"ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax":{"label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax","description":"Amount after tax of reclassification adjustments of other comprehensive income 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