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Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).","units":{"USD":[{"end":"2010-12-31","val":3409000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2010Q4I"},{"end":"2010-12-31","val":3409000,"accn":"0000311471-11-000015","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"end":"2010-12-31","val":3409000,"accn":"0000311471-11-000010","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2011-06-30","val":3607000,"accn":"0000311471-11-000010","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2I"},{"end":"2011-09-30","val":3671000,"accn":"0000311471-11-000015","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07","frame":"CY2011Q3I"},{"end":"2011-12-31","val":4845000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2011Q4I"},{"end":"2011-12-31","val":4845000,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":4845000,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"end":"2011-12-31","val":4845000,"accn":"0000311471-12-000013","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08"},{"end":"2011-12-31","val":4845000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2012-03-31","val":4301000,"accn":"0000311471-12-000013","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08","frame":"CY2012Q1I"},{"end":"2012-06-30","val":4272000,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":5493000,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":8790000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2012Q4I"},{"end":"2012-12-31","val":7742000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":7742000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"end":"2012-12-31","val":7742000,"accn":"0000311471-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07"},{"end":"2012-12-31","val":7742000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"end":"2013-03-31","val":8088000,"accn":"0000311471-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2013Q1I"},{"end":"2013-06-30","val":7032000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2013Q2I"},{"end":"2013-09-30","val":11806000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":12331000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2013Q4I"},{"end":"2013-12-31","val":12331000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"end":"2013-12-31","val":12331000,"accn":"0000311471-14-000006","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08"},{"end":"2013-12-31","val":12331000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07"},{"end":"2014-03-31","val":9512000,"accn":"0000311471-14-000006","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1I"},{"end":"2014-06-30","val":10575000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2014Q2I"},{"end":"2014-09-30","val":14494000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q3I"}]}},"AccumulatedOtherComprehensiveIncomeLossNetOfTax":{"label":"Accumulated Other Comprehensive Income (Loss), Net of Tax","description":"Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.","units":{"USD":[{"end":"2010-12-31","val":-1224000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2010Q4I"},{"end":"2010-12-31","val":-1224000,"accn":"0000311471-11-000015","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"end":"2010-12-31","val":-1224000,"accn":"0000311471-11-000010","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2011-06-30","val":-1224000,"accn":"0000311471-11-000010","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2I"},{"end":"2011-09-30","val":-1305000,"accn":"0000311471-11-000015","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07","frame":"CY2011Q3I"},{"end":"2011-12-31","val":-1450000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2011Q4I"},{"end":"2011-12-31","val":-1450000,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":-1450000,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"end":"2011-12-31","val":-1450000,"accn":"0000311471-12-000013","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08"},{"end":"2011-12-31","val":-1450000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2012-03-31","val":-1450000,"accn":"0000311471-12-000013","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08","frame":"CY2012Q1I"},{"end":"2012-06-30","val":-1450000,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":-1408000,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":-1597000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2012Q4I"},{"end":"2012-12-31","val":-1597000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":-1597000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"end":"2012-12-31","val":-1597000,"accn":"0000311471-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07"},{"end":"2012-12-31","val":-1597000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"end":"2013-03-31","val":-1597000,"accn":"0000311471-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2013Q1I"},{"end":"2013-06-30","val":-1597000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2013Q2I"},{"end":"2013-09-30","val":-1826000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":-1624000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2013Q4I"},{"end":"2013-12-31","val":-1624000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"end":"2013-12-31","val":-1624000,"accn":"0000311471-14-000006","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08"},{"end":"2013-12-31","val":-1624000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07"},{"end":"2014-03-31","val":-1624000,"accn":"0000311471-14-000006","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1I"},{"end":"2014-06-30","val":-1631000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2014Q2I"},{"end":"2014-09-30","val":-1631000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q3I"}]}},"AdditionalPaidInCapitalCommonStock":{"label":"Additional Paid in Capital, Common Stock","description":"Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.","units":{"USD":[{"end":"2010-12-31","val":9106000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2010Q4I"},{"end":"2010-12-31","val":9105000,"accn":"0000311471-11-000015","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"end":"2010-12-31","val":9105000,"accn":"0000311471-11-000010","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2011-06-30","val":9105000,"accn":"0000311471-11-000010","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2I"},{"end":"2011-09-30","val":9105000,"accn":"0000311471-11-000015","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07","frame":"CY2011Q3I"},{"end":"2011-12-31","val":9106000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2011Q4I"},{"end":"2011-12-31","val":9106000,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":9106000,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"end":"2011-12-31","val":9106000,"accn":"0000311471-12-000013","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08"},{"end":"2011-12-31","val":9106000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2012-03-31","val":9106000,"accn":"0000311471-12-000013","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08","frame":"CY2012Q1I"},{"end":"2012-06-30","val":9106000,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":9106000,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":9106000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2012Q4I"},{"end":"2012-12-31","val":9106000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"end":"2012-12-31","val":9106000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"end":"2012-12-31","val":9106000,"accn":"0000311471-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07"},{"end":"2012-12-31","val":9106000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"end":"2013-03-31","val":9106000,"accn":"0000311471-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2013Q1I"},{"end":"2013-06-30","val":9106000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2013Q2I"},{"end":"2013-09-30","val":9106000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":9106000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2013Q4I"},{"end":"2013-12-31","val":9106000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"end":"2013-12-31","val":9106000,"accn":"0000311471-14-000006","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08"},{"end":"2013-12-31","val":9106000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07"},{"end":"2014-03-31","val":9106000,"accn":"0000311471-14-000006","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1I"},{"end":"2014-06-30","val":9106000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2014Q2I"},{"end":"2014-09-30","val":9106000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q3I"}]}},"AssetRetirementObligationsNoncurrent":{"label":"Asset Retirement Obligations, Noncurrent","description":"Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.","units":{"USD":[{"end":"2010-12-31","val":1411000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2010Q4I"},{"end":"2011-12-31","val":2373000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2011Q4I"},{"end":"2011-12-31","val":2373000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2012-12-31","val":2261000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2012Q4I"},{"end":"2012-12-31","val":2261000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"end":"2013-12-31","val":3625000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"}]}},"Assets":{"label":"Assets","description":"Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. 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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":"2010-01-01","end":"2010-12-31","val":6102000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":2046000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":2046000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"start":"2012-01-01","end":"2012-03-31","val":5061000,"accn":"0000311471-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":8103000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"start":"2012-04-01","end":"2012-06-30","val":3042000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2012Q2"},{"start":"2012-01-01","end":"2012-09-30","val":8578000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-07-01","end":"2012-09-30","val":475000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-01-01","end":"2012-12-31","val":8365000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":8365000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"start":"2013-01-01","end":"2013-03-31","val":142000,"accn":"0000311471-14-000006","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-03-31","val":142000,"accn":"0000311471-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07"},{"start":"2013-01-01","end":"2013-06-30","val":2635000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"start":"2013-01-01","end":"2013-06-30","val":2635000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"start":"2013-04-01","end":"2013-06-30","val":2493000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2013Q2"},{"start":"2013-04-01","end":"2013-06-30","val":2493000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"start":"2013-01-01","end":"2013-09-30","val":2862000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04"},{"start":"2013-01-01","end":"2013-09-30","val":2862000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-07-01","end":"2013-09-30","val":227000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2013Q3"},{"start":"2013-07-01","end":"2013-09-30","val":227000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-12-31","val":3089000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":48000,"accn":"0000311471-14-000006","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":107000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"start":"2014-04-01","end":"2014-06-30","val":59000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":336000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04"},{"start":"2014-07-01","end":"2014-09-30","val":229000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q3"}]}},"ExplorationExpense":{"label":"Exploration 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. (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. (v) Costs of drilling exploratory-type stratigraphic test wells.\"","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":994000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2009"},{"start":"2010-01-01","end":"2010-06-30","val":5323000,"accn":"0000311471-11-000010","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2010-04-01","end":"2010-06-30","val":1130000,"accn":"0000311471-11-000010","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":5900000,"accn":"0000311471-11-000015","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2010-07-01","end":"2010-09-30","val":577000,"accn":"0000311471-11-000015","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":3103000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":6102000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"start":"2010-01-01","end":"2010-12-31","val":6102000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2011-01-01","end":"2011-03-31","val":500000,"accn":"0000311471-12-000013","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-06-30","val":1480000,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2011-01-01","end":"2011-06-30","val":1480000,"accn":"0000311471-11-000010","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2011-04-01","end":"2011-06-30","val":980000,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2011Q2"},{"start":"2011-04-01","end":"2011-06-30","val":980000,"accn":"0000311471-11-000010","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2011-01-01","end":"2011-09-30","val":1583000,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2011-01-01","end":"2011-09-30","val":1583000,"accn":"0000311471-11-000015","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2011-07-01","end":"2011-09-30","val":103000,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3"},{"start":"2011-07-01","end":"2011-09-30","val":103000,"accn":"0000311471-11-000015","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2011-01-01","end":"2011-12-31","val":3103000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":3103000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2011-10-01","end":"2011-12-31","val":-1100000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2011Q4"},{"start":"2012-01-01","end":"2012-03-31","val":5061000,"accn":"0000311471-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-03-31","val":5061000,"accn":"0000311471-12-000013","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08"},{"start":"2012-01-01","end":"2012-06-30","val":8103000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07"},{"start":"2012-01-01","end":"2012-06-30","val":8103000,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2012-04-01","end":"2012-06-30","val":3042000,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2012Q2"},{"start":"2012-04-01","end":"2012-06-30","val":3042000,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2012-01-01","end":"2012-09-30","val":10476000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2012-01-01","end":"2012-09-30","val":10476000,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-07-01","end":"2012-09-30","val":2373000,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2012Q3"},{"start":"2012-07-01","end":"2012-09-30","val":2373000,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2012-01-01","end":"2012-12-31","val":11152000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":11152000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"start":"2013-01-01","end":"2013-03-31","val":774000,"accn":"0000311471-14-000006","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-03-31","val":774000,"accn":"0000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"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":10192000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"start":"2014-04-01","end":"2014-06-30","val":7135000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2014Q2"},{"start":"2014-01-01","end":"2014-09-30","val":22823000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04"},{"start":"2014-07-01","end":"2014-09-30","val":12631000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q3"}]}},"ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear":{"label":"Projects that have Exploratory Well Costs that have been Capitalized for Period Greater than One Year, Number of Projects","description":"The number of projects for which exploratory well costs have been capitalized for a period of greater than one year after the completion of drilling.","units":{"pure":[{"end":"2013-12-31","val":1,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"}],"Well":[{"end":"2013-03-31","val":1,"accn":"0000311471-13-000007","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-07","frame":"CY2013Q1I"},{"end":"2013-06-30","val":1,"accn":"0000311471-13-000012","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-07","frame":"CY2013Q2I"},{"end":"2013-09-30","val":1,"accn":"0000311471-13-000015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07","frame":"CY2013Q3I"},{"end":"2013-12-31","val":1,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2013Q4I"},{"end":"2014-03-31","val":1,"accn":"0000311471-14-000006","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-08","frame":"CY2014Q1I"},{"end":"2014-06-30","val":1,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2014Q2I"},{"end":"2014-09-30","val":2,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q3I"}]}},"PropertyPlantAndEquipmentUsefulLifeMaximum":{"label":"Property, Plant and Equipment, Useful Life, Maximum (Deprecated 2012-01-31)","description":"The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. 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":"2012-01-01","end":"2012-03-31","val":15,"accn":"0000311471-12-000013","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":15,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2012-01-01","end":"2012-09-30","val":15,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"}]}},"PropertyPlantAndEquipmentUsefulLifeMinimum":{"label":"Property, Plant and Equipment, Useful Life, Minimum (Deprecated 2012-01-31)","description":"The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. 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":"2012-01-01","end":"2012-03-31","val":3,"accn":"0000311471-12-000013","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":3,"accn":"0000311471-12-000023","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"start":"2012-01-01","end":"2012-09-30","val":3,"accn":"0000311471-12-000026","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"}]}},"ProvedDevelopedReservesVolume":{"label":"Proved Developed Reserves (Volume)","description":"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.","units":{"bbl":[{"end":"2014-06-30","val":142000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q2I"},{"end":"2014-06-30","val":142000,"accn":"0000311471-14-000009","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"end":"2014-09-30","val":169000,"accn":"0000311471-14-000013","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q3I"}]}},"ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves":{"label":"Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves","description":"Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":-1188000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":0,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2011-01-01","end":"2011-12-31","val":101000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":101000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"start":"2011-01-01","end":"2011-12-31","val":-101000,"accn":"0000311471-12-000008","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":0,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013"}]}},"RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty":{"label":"Related Party Transaction, Expenses from Transactions with Related Party","description":"Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":1350000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":1324000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":1324000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"start":"2012-01-01","end":"2012-12-31","val":1698000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":1698000,"accn":"0000311471-13-000004","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"start":"2013-01-01","end":"2013-12-31","val":1955000,"accn":"0000311471-14-000003","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013"}]}},"RepaymentsOfDebt":{"label":"Repayments of Debt","description":"The cash outflow during the period from the repayment of aggregate short-term and long-term debt. 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