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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":154310,"accn":"0001117768-11-000365","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"end":"2010-12-31","val":154310,"accn":"0001117768-11-000504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":154310,"accn":"0001117768-12-000118","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30","frame":"CY2010Q4I"},{"end":"2011-06-30","val":160258,"accn":"0001117768-11-000365","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2011Q2I"},{"end":"2011-09-30","val":115118,"accn":"0001117768-11-000504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":144965,"accn":"0001117768-12-000118","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2011-12-31","val":144965,"accn":"0001117768-12-000198","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":144965,"accn":"0001117768-12-000306","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":144965,"accn":"0001117768-12-000452","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2011-12-31","val":144965,"accn":"0001117768-13-000173","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-04-03","frame":"CY2011Q4I"},{"end":"2012-03-31","val":146790,"accn":"0001117768-12-000198","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":145230,"accn":"0001117768-12-000306","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":142827,"accn":"0001117768-12-000452","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"},{"end":"2012-12-31","val":141738,"accn":"0001117768-13-000173","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-04-03"},{"end":"2012-12-31","val":141738,"accn":"0001117768-13-000252","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14"},{"end":"2012-12-31","val":141738,"accn":"0001117768-13-000390","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"end":"2012-12-31","val":141738,"accn":"0001117768-13-000556","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"end":"2012-12-31","val":141738,"accn":"0001117768-14-000310","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-11","frame":"CY2012Q4I"},{"end":"2013-03-31","val":140553,"accn":"0001117768-13-000252","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2013Q1I"},{"end":"2013-06-30","val":140870,"accn":"0001117768-13-000390","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13","frame":"CY2013Q2I"},{"end":"2013-09-30","val":141140,"accn":"0001117768-13-000556","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13","frame":"CY2013Q3I"},{"end":"2013-12-31","val":141386,"accn":"0001117768-14-000310","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-11"},{"end":"2013-12-31","val":141386,"accn":"0001117768-14-000418","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14"},{"end":"2013-12-31","val":141386,"accn":"0001117768-14-000644","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13"},{"end":"2013-12-31","val":141386,"accn":"0001117768-14-000852","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13","frame":"CY2013Q4I"},{"end":"2014-03-31","val":137556,"accn":"0001117768-14-000418","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14","frame":"CY2014Q1I"},{"end":"2014-06-30","val":140238,"accn":"0001117768-14-000644","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13","frame":"CY2014Q2I"},{"end":"2014-09-30","val":138470,"accn":"0001117768-14-000852","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13","frame":"CY2014Q3I"}]}},"AdditionalPaidInCapital":{"label":"Additional Paid in Capital","description":"Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.","units":{"USD":[{"end":"2010-12-31","val":7173508,"accn":"0001117768-11-000365","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"end":"2010-12-31","val":7173508,"accn":"0001117768-11-000504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":7173508,"accn":"0001117768-12-000118","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30","frame":"CY2010Q4I"},{"end":"2011-06-30","val":7256554,"accn":"0001117768-11-000365","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2011Q2I"},{"end":"2011-09-30","val":7256554,"accn":"0001117768-11-000504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":7297901,"accn":"0001117768-12-000118","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2011-12-31","val":7297901,"accn":"0001117768-12-000198","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":7297901,"accn":"0001117768-12-000306","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":7297901,"accn":"0001117768-12-000452","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2011-12-31","val":7297901,"accn":"0001117768-13-000173","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-04-03","frame":"CY2011Q4I"},{"end":"2012-03-31","val":7339475,"accn":"0001117768-12-000198","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":7425756,"accn":"0001117768-12-000306","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":7467492,"accn":"0001117768-12-000452","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"},{"end":"2012-12-31","val":7487946,"accn":"0001117768-13-000173","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-04-03"},{"end":"2012-12-31","val":7487946,"accn":"0001117768-13-000252","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14"},{"end":"2012-12-31","val":7487946,"accn":"0001117768-13-000390","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"end":"2012-12-31","val":7487946,"accn":"0001117768-13-000556","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"end":"2012-12-31","val":7487946,"accn":"0001117768-14-000310","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-11","frame":"CY2012Q4I"},{"end":"2013-03-31","val":7558172,"accn":"0001117768-13-000252","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2013Q1I"},{"end":"2013-06-30","val":7580783,"accn":"0001117768-13-000390","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13","frame":"CY2013Q2I"},{"end":"2013-09-30","val":7580783,"accn":"0001117768-13-000556","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13","frame":"CY2013Q3I"},{"end":"2013-12-31","val":7580783,"accn":"0001117768-14-000310","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-11"},{"end":"2013-12-31","val":7580783,"accn":"0001117768-14-000418","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14"},{"end":"2013-12-31","val":7580783,"accn":"0001117768-14-000644","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13"},{"end":"2013-12-31","val":7580783,"accn":"0001117768-14-000852","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13","frame":"CY2013Q4I"},{"end":"2014-03-31","val":7580783,"accn":"0001117768-14-000418","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14","frame":"CY2014Q1I"},{"end":"2014-06-30","val":7580783,"accn":"0001117768-14-000644","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13","frame":"CY2014Q2I"},{"end":"2014-09-30","val":7580783,"accn":"0001117768-14-000852","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13","frame":"CY2014Q3I"}]}},"AssetRetirementObligation":{"label":"Asset Retirement Obligation","description":"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":19121,"accn":"0001117768-11-000365","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"end":"2010-12-31","val":19121,"accn":"0001117768-11-000504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":19121,"accn":"0001117768-12-000118","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2010-12-31","val":19121,"accn":"0001117768-12-000306","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2010-12-31","val":19121,"accn":"0001117768-12-000452","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2010-12-31","val":19121,"accn":"0001117768-13-000173","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-04-03","frame":"CY2010Q4I"},{"end":"2011-06-30","val":19213,"accn":"0001117768-11-000365","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2011Q2I"},{"end":"2011-09-30","val":19787,"accn":"0001117768-11-000504","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":16567,"accn":"0001117768-12-000118","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2011-12-31","val":16567,"accn":"0001117768-12-000198","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":16567,"accn":"0001117768-12-000306","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":16567,"accn":"0001117768-12-000452","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14"},{"end":"2011-12-31","val":16567,"accn":"0001117768-13-000173","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-04-03"},{"end":"2011-12-31","val":16567,"accn":"0001117768-13-000252","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14"},{"end":"2011-12-31","val":16567,"accn":"0001117768-13-000390","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"end":"2011-12-31","val":16567,"accn":"0001117768-13-000556","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"end":"2011-12-31","val":16567,"accn":"0001117768-14-000310","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-11","frame":"CY2011Q4I"},{"end":"2012-03-31","val":17064,"accn":"0001117768-12-000198","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":17561,"accn":"0001117768-12-000306","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":18058,"accn":"0001117768-12-000452","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"},{"end":"2012-12-31","val":28115,"accn":"0001117768-13-000173","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-04-03"},{"end":"2012-12-31","val":28115,"accn":"0001117768-13-000252","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14"},{"end":"2012-12-31","val":28115,"accn":"0001117768-13-000390","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13"},{"end":"2012-12-31","val":28115,"accn":"0001117768-13-000556","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13"},{"end":"2012-12-31","val":28115,"accn":"0001117768-14-000310","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-11"},{"end":"2012-12-31","val":28115,"accn":"0001117768-14-000418","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14"},{"end":"2012-12-31","val":28115,"accn":"0001117768-14-000644","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13"},{"end":"2012-12-31","val":28115,"accn":"0001117768-14-000852","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13","frame":"CY2012Q4I"},{"end":"2013-03-31","val":28958,"accn":"0001117768-13-000252","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2013Q1I"},{"end":"2013-06-30","val":29801,"accn":"0001117768-13-000390","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-13","frame":"CY2013Q2I"},{"end":"2013-09-30","val":30644,"accn":"0001117768-13-000556","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-13","frame":"CY2013Q3I"},{"end":"2013-12-31","val":29881,"accn":"0001117768-14-000310","fy":2013,"fp":"FY","form":"10-K","filed":"2014-04-11"},{"end":"2013-12-31","val":29881,"accn":"0001117768-14-000418","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14"},{"end":"2013-12-31","val":29881,"accn":"0001117768-14-000644","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13"},{"end":"2013-12-31","val":29881,"accn":"0001117768-14-000852","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13","frame":"CY2013Q4I"},{"end":"2014-03-31","val":30778,"accn":"0001117768-14-000418","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14","frame":"CY2014Q1I"},{"end":"2014-06-30","val":31674,"accn":"0001117768-14-000644","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-13","frame":"CY2014Q2I"},{"end":"2014-09-30","val":32571,"accn":"0001117768-14-000852","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-13","frame":"CY2014Q3I"}]}},"Assets":{"label":"Assets","description":"Sum 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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 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