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trading.","units":{"USD":[{"end":"2012-12-31","val":5322000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05","frame":"CY2012Q4I"},{"end":"2013-12-31","val":4278000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05"},{"end":"2013-12-31","val":4278000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1626000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12"},{"end":"2014-12-31","val":1626000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2014Q4I"},{"end":"2015-12-31","val":3658000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2015Q4I"}]}},"AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax":{"label":"Available-for-sale Securities, Accumulated Gross Unrealized Gain, before 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any.","units":{"USD":[{"end":"2011-12-31","val":4477000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04","frame":"CY2011Q4I"},{"end":"2012-12-31","val":5320000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04"},{"end":"2012-12-31","val":5320000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05","frame":"CY2012Q4I"},{"end":"2013-12-31","val":4277000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05"},{"end":"2013-12-31","val":4277000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1626000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12"},{"end":"2014-12-31","val":1626000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2014Q4I"},{"end":"2015-12-31","val":3663000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2015Q4I"}]}},"AvailableForSaleSecuritiesCurrent":{"label":"Available-for-sale 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investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2011-12-31","val":2645000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04","frame":"CY2011Q4I"},{"end":"2012-12-31","val":5320000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04"},{"end":"2012-12-31","val":5320000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05","frame":"CY2012Q4I"},{"end":"2013-12-31","val":4277000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05"},{"end":"2013-12-31","val":4277000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1620000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12"},{"end":"2014-12-31","val":1620000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2014Q4I"},{"end":"2015-12-31","val":3653000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2015Q4I"}]}},"AvailableForSaleSecuritiesFairValueDisclosure":{"label":"Available-for-sale 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":"2011-12-31","val":4490000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04","frame":"CY2011Q4I"},{"end":"2012-12-31","val":5322000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04","frame":"CY2012Q4I"}]}},"AvailableForSaleSecuritiesGrossUnrealizedGains":{"label":"Available-for-sale Securities, Gross Unrealized Gain","description":"Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale 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of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.","units":{"USD":[{"end":"2010-01-27","val":1000000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04","frame":"CY2009Q4I"},{"end":"2011-12-31","val":1000000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04","frame":"CY2011Q4I"},{"end":"2012-12-31","val":1000000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04","frame":"CY2012Q4I"}]}},"BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsOtherThanGoodwill":{"label":"Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill (Deprecated 2013-01-31)","description":"Amount of acquisition cost of a business combination allocated to assets, excluding financial assets and goodwill, lacking physical 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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. 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4-398578","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05","frame":"CY2014Q3I"},{"end":"2014-12-31","val":107461000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12"},{"end":"2014-12-31","val":107461000,"accn":"0001193125-15-174461","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06"},{"end":"2014-12-31","val":107461000,"accn":"0001193125-15-279227","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-06"},{"end":"2014-12-31","val":107461000,"accn":"0001193125-15-366570","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05"},{"end":"2014-12-31","val":107461000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2014Q4I"},{"end":"2015-03-31","val":107920000,"accn":"0001193125-15-174461","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06","frame":"CY2015Q1I"},{"end":"2015-06-30","val":112719000,"accn":"0001193125-15-279227","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-06","frame":"CY2015Q2I"},{"end":"2015-09-30","val":112087000,"accn":"0001193125-15-366570","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05","frame":"CY2015Q3I"},{"end":"2015-12-31","val":109396000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07"},{"end":"2015-12-31","val":109396000,"accn":"0001193125-16-577314","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04","frame":"CY2015Q4I"},{"end":"2016-03-31","val":112924000,"accn":"0001193125-16-577314","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04","frame":"CY2016Q1I"}]}},"StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans":{"label":"Stock Issued During Period, Shares, Employee Stock Purchase Plans","description":"Number of shares issued during the period as a result of an employee stock purchase plan.","units":{"shares":[{"start":"2012-01-01","end":"2012-06-30","val":72322,"accn":"0001193125-12-340218","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2012-01-01","end":"2012-09-30","val":72322,"accn":"0001193125-12-453440","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-06"}]}},"StockIssuedDuringPeriodSharesStockOptionsExercised":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period","description":"Number of share options (or share units) exercised during the current period.","units":{"shares":[{"start":"2012-01-01","end":"2012-06-30","val":-7204,"accn":"0001193125-12-340218","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2012-01-01","end":"2012-09-30","val":-11850,"accn":"0001193125-12-453440","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-06"},{"start":"2012-01-01","end":"2012-12-31","val":14317,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":25679,"accn":"0001193125-13-206605","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":90195,"accn":"0001193125-13-320709","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"start":"2013-01-01","end":"2013-09-30","val":144812,"accn":"0001193125-13-432053","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-12-31","val":203564,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":30175,"accn":"0001193125-14-191926","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":98686,"accn":"0001193125-14-298514","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06"},{"start":"2014-01-01","end":"2014-09-30","val":118686,"accn":"0001193125-14-398578","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-05"},{"start":"2014-01-01","end":"2014-12-31","val":148166,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":52497,"accn":"0001193125-15-174461","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-06","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":68975,"accn":"0001193125-15-279227","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-06"},{"start":"2015-01-01","end":"2015-09-30","val":72381,"accn":"0001193125-15-366570","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05"},{"start":"2015-01-01","end":"2015-12-31","val":79231,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":10982,"accn":"0001193125-16-577314","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04","frame":"CY2016Q1"}]}},"StockIssuedDuringPeriodValueAcquisitions":{"label":"Stock Issued During Period, Value, Acquisitions","description":"Value of stock issued pursuant to acquisitions during the period.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":3177000,"accn":"0001193125-11-217810","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-10"},{"start":"2010-01-01","end":"2010-09-30","val":3177000,"accn":"0001193125-11-304540","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2010-01-01","end":"2010-12-31","val":3177000,"accn":"0001193125-12-096585","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-05"},{"start":"2010-01-01","end":"2010-12-31","val":3177000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04","frame":"CY2010"},{"start":"2013-01-01","end":"2013-12-31","val":14524000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05"},{"start":"2013-01-01","end":"2013-12-31","val":14524000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12"},{"start":"2013-01-01","end":"2013-12-31","val":14524000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2013"}]}},"StockIssuedDuringPeriodValueEmployeeStockPurchasePlan":{"label":"Stock 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Excludes employee stock ownership plan (ESOP).","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":549000,"accn":"0001193125-12-096585","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-05","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":502000,"accn":"0001193125-12-096585","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-05"},{"start":"2010-01-01","end":"2010-12-31","val":502000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":401000,"accn":"0001193125-12-096585","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-05"},{"start":"2011-01-01","end":"2011-12-31","val":401000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04"},{"start":"2011-01-01","end":"2011-12-31","val":401000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":398000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04"},{"start":"2012-01-01","end":"2012-12-31","val":398000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05"},{"start":"2012-01-01","end":"2012-12-31","val":398000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":1582000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05"},{"start":"2013-01-01","end":"2013-12-31","val":1582000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12"},{"start":"2013-01-01","end":"2013-12-31","val":1582000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":2101000,"accn":"0001193125-15-087673","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12"},{"start":"2014-01-01","end":"2014-12-31","val":2101000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":1364000,"accn":"0001193125-16-495423","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2015"}]}},"StockRepurchasedDuringPeriodShares":{"label":"Stock Repurchased During Period, Shares","description":"Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. 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Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. 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Directors.","units":{"USD":[{"start":"2011-11-01","end":"2011-11-30","val":0,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05"},{"start":"2012-01-01","end":"2012-06-30","val":0,"accn":"0001193125-12-340218","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2012-11-03","end":"2012-11-30","val":1700000,"accn":"0001193125-13-089459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-04"},{"start":"2012-10-01","end":"2012-12-31","val":1668000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05","frame":"CY2012Q4"},{"start":"2012-10-01","end":"2013-03-31","val":1610000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05"},{"start":"2013-01-01","end":"2013-03-31","val":1600000,"accn":"0001193125-13-206605","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08"},{"start":"2013-01-01","end":"2013-03-31","val":1610000,"accn":"0001193125-14-082812","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-05","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":1600000,"accn":"0001193125-13-320709","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"start":"2013-01-01","end":"2013-09-30","val":1600000,"accn":"0001193125-13-432053","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2014-01-01","end":"2014-03-31","val":800000,"accn":"0001193125-14-191926","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2014Q1"},{"end":"2014-06-30","val":2600000,"accn":"0001193125-14-298514","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-06","frame":"CY2014Q2I"}]}},"StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1":{"label":"Stock 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