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Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate 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have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.","units":{"shares":[{"end":"2012-12-31","val":46691000,"accn":"0001112412-13-000007","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09"},{"end":"2012-12-31","val":46691000,"accn":"0001562762-13-000367","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":46691000,"accn":"0001562762-14-000072","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2012Q4I"},{"end":"2013-06-30","val":47137000,"accn":"0001112412-13-000007","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09","frame":"CY2013Q2I"},{"end":"2013-09-30","val":47119000,"accn":"0001562762-13-000367","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":46981000,"accn":"0001562762-14-000072","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"end":"2013-12-31","val":46981000,"accn":"0001112412-14-000018","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09"},{"end":"2013-12-31","val":46981000,"accn":"0001562762-14-000213","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"end":"2013-12-31","val":46981000,"accn":"0001112412-14-000026","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":46981000,"accn":"0001112412-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-03-31","val":50395000,"accn":"0001112412-14-000018","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2014Q1I"},{"end":"2014-06-30","val":50479000,"accn":"0001562762-14-000213","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08","frame":"CY2014Q2I"},{"end":"2014-09-30","val":53016000,"accn":"0001112412-14-000026","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":52900000,"accn":"0001112412-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2014-12-31","val":52900000,"accn":"0001112412-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11"},{"end":"2014-12-31","val":52900000,"accn":"0001112412-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2014Q4I"},{"end":"2015-03-31","val":52834000,"accn":"0001112412-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11","frame":"CY2015Q1I"},{"end":"2015-06-30","val":52828000,"accn":"0001112412-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2015Q2I"}]}},"CommonStockSharesOutstanding":{"label":"Common Stock, Shares, Outstanding","description":"Number of shares of common stock outstanding. Common stock represent the ownership interest in a 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"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' 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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":[{"end":"2012-12-31","val":188481000,"accn":"0001193125-13-112308","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-12-31","val":202562000,"accn":"0001562762-14-000072","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2013Q4I"},{"end":"2014-12-31","val":10784000,"accn":"0001112412-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts":{"label":"Extensions, Discoveries, Additions and Improved Recovery, Less Related 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of Ordinary Dividends, Preferred Stock and Preference Stock","description":"Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent 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Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.","units":{"USD":[{"start":"2012-10-01","end":"2012-12-31","val":7000000,"accn":"0001562762-14-000072","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2012Q4"}]}},"TemporaryEquityCarryingAmount":{"label":"Temporary Equity, Carrying Amount (Deprecated 2012-01-31)","description":"The carrying value (book value) of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2010-12-31","val":53152000,"accn":"0001193125-13-028328","fy":2011,"fp":"FY","form":"8-K","filed":"2013-01-29","frame":"CY2010Q4I"},{"end":"2010-12-31","val":53152000,"accn":"0001193125-12-101841","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-08"},{"end":"2010-12-31","val":53152000,"accn":"0000950123-11-096554","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2010-12-31","val":53152000,"accn":"0000950123-11-082469","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-02"},{"end":"2011-06-30","val":48428000,"accn":"0000950123-11-082469","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-02","frame":"CY2011Q2I"},{"end":"2011-09-30","val":43703000,"accn":"0000950123-11-096554","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2011Q3I"},{"end":"2011-12-31","val":43703000,"accn":"0001193125-13-028328","fy":2011,"fp":"FY","form":"8-K","filed":"2013-01-29","frame":"CY2011Q4I"},{"end":"2011-12-31","val":43703000,"accn":"0001193125-12-219481","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09"},{"end":"2011-12-31","val":43703000,"accn":"0001193125-12-101841","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-08"},{"end":"2012-03-31","val":43703000,"accn":"0001193125-12-219481","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2012Q1I"}]}},"TemporaryEquityCarryingAmountAttributableToParent":{"label":"Temporary Equity, Carrying Amount, Attributable to Parent","description":"Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. 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Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2011-12-31","val":43703000,"accn":"0001193125-13-028341","fy":2012,"fp":"Q3","form":"8-K","filed":"2013-01-29"},{"end":"2011-12-31","val":43703000,"accn":"0001193125-13-112308","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2012-09-30","val":43703000,"accn":"0001193125-13-028341","fy":2012,"fp":"Q3","form":"8-K","filed":"2013-01-29","frame":"CY2012Q3I"},{"end":"2012-12-31","val":43703000,"accn":"0001193125-13-112308","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2012-12-31","val":43703000,"accn":"0001193125-13-213711","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":43703000,"accn":"0001112412-13-000007","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09"},{"end":"2012-12-31","val":43703000,"accn":"0001562762-13-000367","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":43703000,"accn":"0001562762-14-000072","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2012Q4I"},{"end":"2013-03-31","val":43703000,"accn":"0001193125-13-213711","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":43703000,"accn":"0001112412-13-000007","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09","frame":"CY2013Q2I"},{"end":"2013-09-30","val":43703000,"accn":"0001562762-13-000367","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":43703000,"accn":"0001562762-14-000072","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"end":"2013-12-31","val":43703000,"accn":"0001112412-14-000018","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09"},{"end":"2013-12-31","val":43703000,"accn":"0001562762-14-000213","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"end":"2013-12-31","val":43703000,"accn":"0001112412-14-000026","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":43703000,"accn":"0001112412-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-03-31","val":43703000,"accn":"0001112412-14-000018","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2014Q1I"},{"end":"2014-06-30","val":43703000,"accn":"0001562762-14-000213","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08","frame":"CY2014Q2I"},{"end":"2014-09-30","val":17481000,"accn":"0001112412-14-000026","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":17481000,"accn":"0001112412-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2014-12-31","val":17481000,"accn":"0001112412-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11"},{"end":"2014-12-31","val":17481000,"accn":"0001112412-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2014Q4I"},{"end":"2015-03-31","val":17481000,"accn":"0001112412-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11","frame":"CY2015Q1I"},{"end":"2015-06-30","val":17481000,"accn":"0001112412-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2015Q2I"}]}},"TemporaryEquityRedemptionValue":{"label":"Temporary Equity, Redemption Value (Deprecated 2014-01-31)","description":"The aggregate amount to be paid by the entity upon redemption of the security that is classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2010-12-31","val":45000000,"accn":"0001193125-13-028328","fy":2011,"fp":"FY","form":"8-K","filed":"2013-01-29","frame":"CY2010Q4I"},{"end":"2010-12-31","val":45000000,"accn":"0001193125-12-101841","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-08"},{"end":"2010-12-31","val":45000000,"accn":"0000950123-11-096554","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2010-12-31","val":45000000,"accn":"0000950123-11-082469","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-02"},{"end":"2011-06-30","val":41000000,"accn":"0000950123-11-082469","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-02","frame":"CY2011Q2I"},{"end":"2011-09-30","val":37000000,"accn":"0000950123-11-096554","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2011Q3I"},{"end":"2011-12-31","val":37000000,"accn":"0001193125-13-028328","fy":2011,"fp":"FY","form":"8-K","filed":"2013-01-29","frame":"CY2011Q4I"},{"end":"2011-12-31","val":37000000,"accn":"0001193125-12-219481","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09"},{"end":"2011-12-31","val":37000000,"accn":"0001193125-12-101841","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-08"},{"end":"2012-03-31","val":37000000,"accn":"0001193125-12-219481","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2012Q1I"}]}},"TreasuryStockShares":{"label":"Treasury Stock, Shares","description":"Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.","units":{"shares":[{"end":"2010-12-31","val":72000,"accn":"0000950123-11-082469","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-02"},{"end":"2010-12-31","val":72000,"accn":"0000950123-11-096554","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2010-12-31","val":72,"accn":"0001193125-12-101841","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-08"},{"end":"2010-12-31","val":72,"accn":"0001193125-13-028328","fy":2011,"fp":"FY","form":"8-K","filed":"2013-01-29","frame":"CY2010Q4I"},{"end":"2011-06-30","val":72000,"accn":"0000950123-11-082469","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-02","frame":"CY2011Q2I"},{"end":"2011-09-30","val":72000,"accn":"0000950123-11-096554","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2011Q3I"},{"end":"2011-12-31","val":72,"accn":"0001193125-12-101841","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-08"},{"end":"2011-12-31","val":72000,"accn":"0001193125-12-219481","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09"},{"end":"2011-12-31","val":72000,"accn":"0001193125-12-385040","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-09-07"},{"end":"2011-12-31","val":72000,"accn":"0001193125-12-458134","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":72,"accn":"0001193125-13-028328","fy":2011,"fp":"FY","form":"8-K","filed":"2013-01-29"},{"end":"2011-12-31","val":72000,"accn":"0001193125-13-028341","fy":2012,"fp":"Q3","form":"8-K","filed":"2013-01-29"},{"end":"2011-12-31","val":72,"accn":"0001193125-13-112308","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2011Q4I"},{"end":"2012-03-31","val":72000,"accn":"0001193125-12-219481","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2012Q1I"},{"end":"2012-06-30","val":72000,"accn":"0001193125-12-385040","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-09-07","frame":"CY2012Q2I"},{"end":"2012-09-30","val":72000,"accn":"0001193125-12-458134","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2012-09-30","val":72000,"accn":"0001193125-13-028341","fy":2012,"fp":"Q3","form":"8-K","filed":"2013-01-29","frame":"CY2012Q3I"},{"end":"2012-12-31","val":72,"accn":"0001193125-13-112308","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"end":"2012-12-31","val":72000,"accn":"0001193125-13-213711","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10"},{"end":"2012-12-31","val":72000,"accn":"0001112412-13-000007","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09"},{"end":"2012-12-31","val":72000,"accn":"0001562762-13-000367","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12"},{"end":"2012-12-31","val":72000,"accn":"0001562762-14-000072","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2012Q4I"},{"end":"2013-03-31","val":72000,"accn":"0001193125-13-213711","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-06-30","val":72000,"accn":"0001112412-13-000007","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09","frame":"CY2013Q2I"},{"end":"2013-09-30","val":72000,"accn":"0001562762-13-000367","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2013-12-31","val":72000,"accn":"0001562762-14-000072","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"end":"2013-12-31","val":72000,"accn":"0001112412-14-000018","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09"},{"end":"2013-12-31","val":72000,"accn":"0001562762-14-000213","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08"},{"end":"2013-12-31","val":72000,"accn":"0001112412-14-000026","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"},{"end":"2013-12-31","val":72000,"accn":"0001112412-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-03-31","val":72000,"accn":"0001112412-14-000018","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2014Q1I"},{"end":"2014-06-30","val":72000,"accn":"0001562762-14-000213","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-08","frame":"CY2014Q2I"},{"end":"2014-09-30","val":72000,"accn":"0001112412-14-000026","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2014Q3I"},{"end":"2014-12-31","val":72000,"accn":"0001112412-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2014-12-31","val":72000,"accn":"0001112412-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11"},{"end":"2014-12-31","val":72000,"accn":"0001112412-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2014Q4I"},{"end":"2015-03-31","val":72000,"accn":"0001112412-15-000006","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11","frame":"CY2015Q1I"},{"end":"2015-06-30","val":72000,"accn":"0001112412-15-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-07","frame":"CY2015Q2I"}]}},"TreasuryStockValue":{"label":"Treasury 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