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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. 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Securities, Fair Value Disclosure (Deprecated 2013-01-31)","description":"This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.","units":{"USD":[{"end":"2011-06-30","val":64191000,"accn":"0001193125-11-213996","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2I"}]}},"AvailableForSaleSecuritiesGrossRealizedGainLossNet":{"label":"Available-for-sale Securities, Gross Realized Gain (Loss)","description":"This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":0,"accn":"0001193125-11-213996","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2010-04-01","end":"2010-06-30","val":0,"accn":"0001193125-11-213996","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2010Q2"},{"start":"2011-01-01","end":"2011-06-30","val":0,"accn":"0001193125-11-213996","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"start":"2011-04-01","end":"2011-06-30","val":0,"accn":"0001193125-11-213996","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2"}]}},"AvailableForSaleSecuritiesNoncurrent":{"label":"Available-for-sale Securities, Noncurrent","description":"Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. 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. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. 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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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An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.","units":{"segment":[{"start":"2012-01-01","end":"2012-12-31","val":2,"accn":"0001097149-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":2,"accn":"0001445305-14-000789","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-28","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":2,"accn":"0001097149-15-000005","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":2,"accn":"0001097149-16-000031","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-25","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":2,"accn":"0001097149-17-000009","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-28","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":2,"accn":"0001097149-18-000010","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2017"},{"start":"2018-01-01","end":"2018-12-31","val":2,"accn":"0001097149-19-000009","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28","frame":"CY2018"},{"start":"2019-01-01","end":"2019-12-31","val":2,"accn":"0001097149-20-000008","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2019"},{"start":"2020-01-01","end":"2020-12-31","val":2,"accn":"0001097149-21-000007","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-26","frame":"CY2020"},{"start":"2021-01-01","end":"2021-12-31","val":2,"accn":"0001097149-22-000011","fy":2021,"fp":"FY","form":"10-K","filed":"2022-02-25","frame":"CY2021"},{"start":"2022-01-01","end":"2022-12-31","val":2,"accn":"0001097149-23-000013","fy":2022,"fp":"FY","form":"10-K","filed":"2023-02-27","frame":"CY2022"},{"start":"2023-01-01","end":"2023-12-31","val":2,"accn":"0001097149-24-000011","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-28","frame":"CY2023"},{"start":"2024-01-01","end":"2024-12-31","val":2,"accn":"0001097149-25-000012","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-28","frame":"CY2024"},{"start":"2025-01-01","end":"2025-12-31","val":2,"accn":"0001097149-26-000014","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-27","frame":"CY2025"}]}},"NumberOfReportableSegments":{"label":"Number of Reportable Segments","description":"Number of segments reported by the entity. 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