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An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. 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":"2013-01-01","end":"2013-09-30","val":6,"accn":"0001193125-13-433206","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-07"},{"start":"2013-01-01","end":"2013-12-31","val":6,"accn":"0001193125-14-091756","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-10","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":6,"accn":"0001193125-14-179104","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":6,"accn":"0001193125-14-290991","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-01"},{"start":"2014-01-01","end":"2014-06-30","val":6,"accn":"0001193125-14-393853","fy":2014,"fp":"Q2","form":"10-Q/A","filed":"2014-11-03"},{"start":"2014-01-01","end":"2014-09-30","val":6,"accn":"0001193125-14-393936","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-03"},{"start":"2014-01-01","end":"2014-12-31","val":6,"accn":"0001193125-15-076985","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-04","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":6,"accn":"0001193125-15-168227","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":6,"accn":"0001193125-15-272233","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-31"},{"start":"2015-01-01","end":"2015-09-30","val":6,"accn":"0001193125-15-359576","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30"},{"start":"2015-01-01","end":"2015-12-31","val":6,"accn":"0001193125-16-495394","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":6,"accn":"0001193125-16-577000","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":6,"accn":"0001193125-16-671223","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"start":"2016-01-01","end":"2016-09-30","val":6,"accn":"0001193125-16-761723","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07"},{"start":"2016-01-01","end":"2016-12-31","val":6,"accn":"0001193125-17-080126","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-13","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":6,"accn":"0001193125-17-155136","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":6,"accn":"0001193125-17-252748","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09"},{"start":"2017-01-01","end":"2017-09-30","val":6,"accn":"0001193125-17-332154","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03"},{"start":"2017-01-01","end":"2017-12-31","val":6,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":4,"accn":"0001193125-18-152093","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":4,"accn":"0001193125-18-237365","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03"},{"start":"2018-01-01","end":"2018-09-30","val":4,"accn":"0001193125-18-316888","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"start":"2018-01-01","end":"2018-12-31","val":4,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2018"}]}},"NumberOfReportableSegments":{"label":"Number of Reportable Segments","description":"Number of segments reported by the entity. 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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.","units":{"USD/shares":[{"end":"2014-12-31","val":0.001,"accn":"0001193125-15-168227","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04"},{"end":"2014-12-31","val":0.001,"accn":"0001193125-15-272233","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-31"},{"end":"2014-12-31","val":0.001,"accn":"0001193125-15-359576","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30"},{"end":"2014-12-31","val":0.001,"accn":"0001193125-16-495394","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2014Q4I"},{"end":"2015-03-31","val":0.001,"accn":"0001193125-15-168227","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2015Q1I"},{"end":"2015-06-30","val":0.001,"accn":"0001193125-15-272233","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-31","frame":"CY2015Q2I"},{"end":"2015-09-30","val":0.001,"accn":"0001193125-15-359576","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30","frame":"CY2015Q3I"},{"end":"2015-12-31","val":0.001,"accn":"0001193125-16-495394","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07"},{"end":"2015-12-31","val":0.001,"accn":"0001193125-16-577000","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04"},{"end":"2015-12-31","val":0.001,"accn":"0001193125-16-671223","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"end":"2015-12-31","val":0.001,"accn":"0001193125-16-761723","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07"},{"end":"2015-12-31","val":0.001,"accn":"0001193125-17-080126","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-13","frame":"CY2015Q4I"},{"end":"2016-03-31","val":0.001,"accn":"0001193125-16-577000","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04","frame":"CY2016Q1I"},{"end":"2016-06-30","val":0.001,"accn":"0001193125-16-671223","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04","frame":"CY2016Q2I"},{"end":"2016-09-30","val":0.001,"accn":"0001193125-16-761723","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07","frame":"CY2016Q3I"},{"end":"2016-12-31","val":0.001,"accn":"0001193125-17-080126","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-13"},{"end":"2016-12-31","val":0.001,"accn":"0001193125-17-155136","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03"},{"end":"2016-12-31","val":0.001,"accn":"0001193125-17-252748","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09"},{"end":"2016-12-31","val":0.001,"accn":"0001193125-17-332154","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03"},{"end":"2016-12-31","val":0.001,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":0.001,"accn":"0001193125-17-155136","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03","frame":"CY2017Q1I"},{"end":"2017-06-30","val":0.001,"accn":"0001193125-17-252748","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09","frame":"CY2017Q2I"},{"end":"2017-09-30","val":0.001,"accn":"0001193125-17-332154","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03","frame":"CY2017Q3I"},{"end":"2017-12-31","val":0.001,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02"},{"end":"2017-12-31","val":0.001,"accn":"0001193125-18-152093","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04"},{"end":"2017-12-31","val":0.001,"accn":"0001193125-18-237365","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03"},{"end":"2017-12-31","val":0.001,"accn":"0001193125-18-316888","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2017-12-31","val":0.001,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2017Q4I"},{"end":"2018-03-31","val":0.001,"accn":"0001193125-18-152093","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04","frame":"CY2018Q1I"},{"end":"2018-06-30","val":0.001,"accn":"0001193125-18-237365","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03","frame":"CY2018Q2I"},{"end":"2018-09-30","val":0.001,"accn":"0001193125-18-316888","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":0.001,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2018Q4I"}]}},"TemporaryEquitySharesAuthorized":{"label":"Temporary Equity, Shares Authorized","description":"The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. 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Securities issued include securities outstanding and securities held in treasury. 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":{"shares":[{"end":"2014-12-31","val":50000,"accn":"0001193125-15-168227","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04"},{"end":"2014-12-31","val":50000,"accn":"0001193125-15-272233","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-31"},{"end":"2014-12-31","val":50000,"accn":"0001193125-15-359576","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30"},{"end":"2014-12-31","val":50000,"accn":"0001193125-16-495394","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2014Q4I"},{"end":"2015-03-31","val":50000,"accn":"0001193125-15-168227","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2015Q1I"},{"end":"2015-06-30","val":50000,"accn":"0001193125-15-272233","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-31","frame":"CY2015Q2I"},{"end":"2015-09-30","val":50000,"accn":"0001193125-15-359576","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30","frame":"CY2015Q3I"},{"end":"2015-12-31","val":50000,"accn":"0001193125-16-495394","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07"},{"end":"2015-12-31","val":50000,"accn":"0001193125-16-577000","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04"},{"end":"2015-12-31","val":50000,"accn":"0001193125-16-671223","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"end":"2015-12-31","val":50000,"accn":"0001193125-16-761723","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07"},{"end":"2015-12-31","val":50000,"accn":"0001193125-17-080126","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-13","frame":"CY2015Q4I"},{"end":"2016-03-31","val":50000,"accn":"0001193125-16-577000","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04","frame":"CY2016Q1I"},{"end":"2016-06-30","val":50000,"accn":"0001193125-16-671223","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04","frame":"CY2016Q2I"},{"end":"2016-09-30","val":50000,"accn":"0001193125-16-761723","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07","frame":"CY2016Q3I"},{"end":"2016-12-31","val":50000,"accn":"0001193125-17-080126","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-13"},{"end":"2016-12-31","val":50000,"accn":"0001193125-17-155136","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03"},{"end":"2016-12-31","val":50000,"accn":"0001193125-17-252748","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09"},{"end":"2016-12-31","val":50000,"accn":"0001193125-17-332154","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03"},{"end":"2016-12-31","val":50000,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":50000,"accn":"0001193125-17-155136","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03","frame":"CY2017Q1I"},{"end":"2017-06-30","val":50000,"accn":"0001193125-17-252748","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09","frame":"CY2017Q2I"},{"end":"2017-09-30","val":50000,"accn":"0001193125-17-332154","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03","frame":"CY2017Q3I"},{"end":"2017-12-31","val":50000,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02"},{"end":"2017-12-31","val":50000,"accn":"0001193125-18-152093","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04"},{"end":"2017-12-31","val":50000,"accn":"0001193125-18-237365","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03"},{"end":"2017-12-31","val":50000,"accn":"0001193125-18-316888","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2017-12-31","val":50000,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2017Q4I"},{"end":"2018-03-31","val":50000,"accn":"0001193125-18-152093","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04","frame":"CY2018Q1I"},{"end":"2018-06-30","val":50000,"accn":"0001193125-18-237365","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03","frame":"CY2018Q2I"},{"end":"2018-09-30","val":50000,"accn":"0001193125-18-316888","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":50000,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2018Q4I"}]}},"TemporaryEquitySharesOutstanding":{"label":"Temporary Equity, Shares Outstanding","description":"The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. 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":{"shares":[{"end":"2014-12-31","val":50000,"accn":"0001193125-15-168227","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04"},{"end":"2014-12-31","val":50000,"accn":"0001193125-15-272233","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-31"},{"end":"2014-12-31","val":50000,"accn":"0001193125-15-359576","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30"},{"end":"2014-12-31","val":50000,"accn":"0001193125-16-495394","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07","frame":"CY2014Q4I"},{"end":"2015-03-31","val":50000,"accn":"0001193125-15-168227","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-04","frame":"CY2015Q1I"},{"end":"2015-06-30","val":50000,"accn":"0001193125-15-272233","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-31","frame":"CY2015Q2I"},{"end":"2015-09-30","val":50000,"accn":"0001193125-15-359576","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30","frame":"CY2015Q3I"},{"end":"2015-12-31","val":50000,"accn":"0001193125-16-495394","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-07"},{"end":"2015-12-31","val":50000,"accn":"0001193125-16-577000","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04"},{"end":"2015-12-31","val":50000,"accn":"0001193125-16-671223","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"end":"2015-12-31","val":50000,"accn":"0001193125-16-761723","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07"},{"end":"2015-12-31","val":50000,"accn":"0001193125-17-080126","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-13","frame":"CY2015Q4I"},{"end":"2016-03-31","val":50000,"accn":"0001193125-16-577000","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-04","frame":"CY2016Q1I"},{"end":"2016-06-30","val":50000,"accn":"0001193125-16-671223","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04","frame":"CY2016Q2I"},{"end":"2016-09-30","val":50000,"accn":"0001193125-16-761723","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-07","frame":"CY2016Q3I"},{"end":"2016-12-31","val":50000,"accn":"0001193125-17-080126","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-13"},{"end":"2016-12-31","val":50000,"accn":"0001193125-17-155136","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03"},{"end":"2016-12-31","val":50000,"accn":"0001193125-17-252748","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09"},{"end":"2016-12-31","val":50000,"accn":"0001193125-17-332154","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03"},{"end":"2016-12-31","val":50000,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":50000,"accn":"0001193125-17-155136","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03","frame":"CY2017Q1I"},{"end":"2017-06-30","val":50000,"accn":"0001193125-17-252748","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09","frame":"CY2017Q2I"},{"end":"2017-09-30","val":50000,"accn":"0001193125-17-332154","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03","frame":"CY2017Q3I"},{"end":"2017-12-31","val":50000,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02"},{"end":"2017-12-31","val":50000,"accn":"0001193125-18-152093","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04"},{"end":"2017-12-31","val":50000,"accn":"0001193125-18-237365","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03"},{"end":"2017-12-31","val":50000,"accn":"0001193125-18-316888","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2017-12-31","val":50000,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2017Q4I"},{"end":"2018-03-31","val":50000,"accn":"0001193125-18-152093","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04","frame":"CY2018Q1I"},{"end":"2018-06-30","val":50000,"accn":"0001193125-18-237365","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03","frame":"CY2018Q2I"},{"end":"2018-09-30","val":50000,"accn":"0001193125-18-316888","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":50000,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2018Q4I"}]}},"TemporaryEquityValueExcludingAdditionalPaidInCapital":{"label":"Temporary Equity, Par Value","description":"Carrying amount of the par value of temporary equity outstanding. 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. 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":"2014-12-31","val":52834000,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02","frame":"CY2014Q4I"},{"end":"2015-12-31","val":56323000,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02"},{"end":"2015-12-31","val":56323000,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2015Q4I"},{"end":"2016-12-31","val":60016000,"accn":"0001193125-17-155136","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03"},{"end":"2016-12-31","val":60016000,"accn":"0001193125-17-252748","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09"},{"end":"2016-12-31","val":60016000,"accn":"0001193125-17-332154","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03"},{"end":"2016-12-31","val":60016000,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02"},{"end":"2016-12-31","val":60016000,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2016Q4I"},{"end":"2017-03-31","val":60972000,"accn":"0001193125-17-155136","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-03","frame":"CY2017Q1I"},{"end":"2017-06-30","val":61941000,"accn":"0001193125-17-252748","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09","frame":"CY2017Q2I"},{"end":"2017-09-30","val":62925000,"accn":"0001193125-17-332154","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-03","frame":"CY2017Q3I"},{"end":"2017-12-31","val":63923000,"accn":"0001193125-18-068642","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-02"},{"end":"2017-12-31","val":63923000,"accn":"0001193125-18-152093","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04"},{"end":"2017-12-31","val":63923000,"accn":"0001193125-18-237365","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03"},{"end":"2017-12-31","val":63923000,"accn":"0001193125-18-316888","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02"},{"end":"2017-12-31","val":63923000,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2017Q4I"},{"end":"2018-03-31","val":64935000,"accn":"0001193125-18-152093","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-04","frame":"CY2018Q1I"},{"end":"2018-06-30","val":65961000,"accn":"0001193125-18-237365","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-03","frame":"CY2018Q2I"},{"end":"2018-09-30","val":66180000,"accn":"0001193125-18-316888","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-02","frame":"CY2018Q3I"},{"end":"2018-12-31","val":66226000,"accn":"0001193125-19-063391","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05","frame":"CY2018Q4I"}]}},"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. 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