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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":21467000,"accn":"0001445305-11-003319","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"end":"2010-12-31","val":21467000,"accn":"0001193125-11-214600","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"end":"2010-12-31","val":21467000,"accn":"0001193125-11-134434","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10"},{"end":"2010-12-31","val":21467000,"accn":"0000903571-12-000002","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23","frame":"CY2010Q4I"},{"end":"2011-03-31","val":22530000,"accn":"0001193125-11-134434","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10","frame":"CY2011Q1I"},{"end":"2011-06-30","val":24529000,"accn":"0001193125-11-214600","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"end":"2011-06-30","val":24529000,"accn":"0000903571-12-000011","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2011Q2I"},{"end":"2011-09-30","val":22311000,"accn":"0001445305-11-003319","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"end":"2011-09-30","val":22311000,"accn":"0000903571-12-000016","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2011Q3I"},{"end":"2011-12-31","val":24884000,"accn":"0000903571-13-000005","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-05","frame":"CY2011Q4I"},{"end":"2011-12-31","val":24884000,"accn":"0000903571-12-000016","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":24884000,"accn":"0000903571-12-000011","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"end":"2011-12-31","val":24884000,"accn":"0000903571-12-000005","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"end":"2011-12-31","val":24884000,"accn":"0000903571-12-000002","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"end":"2012-03-31","val":23382000,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2012Q1I"},{"end":"2012-03-31","val":23382000,"accn":"0000903571-12-000005","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"end":"2012-06-30","val":22610000,"accn":"0000903571-12-000011","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":22716000,"accn":"0000903571-12-000016","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":24170000,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2012Q4I"},{"end":"2012-12-31","val":24170000,"accn":"0000903571-13-000005","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-05"},{"end":"2013-03-31","val":24768000,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2013Q1I"}]}},"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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Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. 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Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.","units":{"USD/shares":[{"start":"2012-01-01","end":"2012-03-31","val":0.04,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2012Q1"},{"start":"2013-01-01","end":"2013-03-31","val":-0.03,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2013Q1"}]}},"EarningsPerShareDiluted":{"label":"Earnings Per Share, Diluted","description":"The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding 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(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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Excludes preferred shares that are classified as debt.","units":{"shares":[{"end":"2010-12-31","val":0,"accn":"0001445305-11-003319","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"end":"2010-12-31","val":0,"accn":"0001193125-11-214600","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"end":"2010-12-31","val":0,"accn":"0001193125-11-134434","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10"},{"end":"2010-12-31","val":0,"accn":"0000903571-12-000002","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23","frame":"CY2010Q4I"},{"end":"2011-03-31","val":0,"accn":"0001193125-11-134434","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10","frame":"CY2011Q1I"},{"end":"2011-06-30","val":0,"accn":"0001193125-11-214600","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2011Q2I"},{"end":"2011-09-30","val":0,"accn":"0001445305-11-003319","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09","frame":"CY2011Q3I"},{"end":"2011-12-31","val":0,"accn":"0000903571-13-000005","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-05","frame":"CY2011Q4I"},{"end":"2011-12-31","val":0,"accn":"0000903571-12-000016","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":0,"accn":"0000903571-12-000011","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"end":"2011-12-31","val":0,"accn":"0000903571-12-000005","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"end":"2011-12-31","val":0,"accn":"0000903571-12-000002","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"end":"2012-03-31","val":0,"accn":"0000903571-12-000005","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2012Q1I"},{"end":"2012-06-30","val":0,"accn":"0000903571-12-000011","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0000903571-12-000016","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2012Q4I"},{"end":"2012-12-31","val":0,"accn":"0000903571-13-000005","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-05"},{"end":"2013-03-31","val":0,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2013Q1I"}]}},"PreferredStockSharesOutstanding":{"label":"Preferred Stock, Shares Outstanding","description":"Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. 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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":"2010-12-31","val":0,"accn":"0001445305-11-003319","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"end":"2010-12-31","val":0,"accn":"0000903571-12-000002","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23","frame":"CY2010Q4I"},{"end":"2011-09-30","val":0,"accn":"0001445305-11-003319","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09","frame":"CY2011Q3I"},{"end":"2011-12-31","val":0,"accn":"0000903571-13-000005","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-05","frame":"CY2011Q4I"},{"end":"2011-12-31","val":0,"accn":"0000903571-12-000016","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":0,"accn":"0000903571-12-000011","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"end":"2011-12-31","val":0,"accn":"0000903571-12-000005","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"end":"2011-12-31","val":0,"accn":"0000903571-12-000002","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"end":"2012-03-31","val":0,"accn":"0000903571-12-000005","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2012Q1I"},{"end":"2012-06-30","val":0,"accn":"0000903571-12-000011","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":0,"accn":"0000903571-12-000016","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":0,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2012Q4I"},{"end":"2012-12-31","val":0,"accn":"0000903571-13-000005","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-05"},{"end":"2013-03-31","val":0,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2013Q1I"}]}},"PrepaidExpenseAndOtherAssetsCurrent":{"label":"Prepaid Expense and Other Assets, Current","description":"Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.","units":{"USD":[{"end":"2010-12-31","val":1522000,"accn":"0001445305-11-003319","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"end":"2010-12-31","val":1522000,"accn":"0001193125-11-214600","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"end":"2010-12-31","val":1522000,"accn":"0000903571-12-000002","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23","frame":"CY2010Q4I"},{"end":"2011-06-30","val":2735000,"accn":"0001193125-11-214600","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2011Q2I"},{"end":"2011-09-30","val":2097000,"accn":"0001445305-11-003319","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09","frame":"CY2011Q3I"},{"end":"2011-12-31","val":2048000,"accn":"0000903571-13-000005","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-05","frame":"CY2011Q4I"},{"end":"2011-12-31","val":2048000,"accn":"0000903571-12-000016","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":2048000,"accn":"0000903571-12-000011","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"end":"2011-12-31","val":2048000,"accn":"0000903571-12-000005","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10"},{"end":"2011-12-31","val":2048000,"accn":"0000903571-12-000002","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"end":"2012-03-31","val":2071000,"accn":"0000903571-12-000005","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2012Q1I"},{"end":"2012-06-30","val":2167000,"accn":"0000903571-12-000011","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-09-30","val":2173000,"accn":"0000903571-12-000016","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":2666000,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2012Q4I"},{"end":"2012-12-31","val":2666000,"accn":"0000903571-13-000005","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-05"},{"end":"2013-03-31","val":4173000,"accn":"0000903571-13-000010","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2013Q1I"}]}},"ProceedsFromIssuanceOfDebt":{"label":"Proceeds from Issuance of Debt","description":"The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term 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