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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":"2010-12-31","val":16287377,"accn":"0001193125-11-200901","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-28"},{"end":"2010-12-31","val":16287377,"accn":"0001193125-11-284127","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27"},{"end":"2010-12-31","val":16287377,"accn":"0001193125-12-075518","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23","frame":"CY2010Q4I"},{"end":"2011-06-30","val":16423085,"accn":"0001193125-11-200901","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-28","frame":"CY2011Q2I"},{"end":"2011-09-30","val":16443255,"accn":"0001193125-11-284127","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27","frame":"CY2011Q3I"},{"end":"2011-12-31","val":16474988,"accn":"0001193125-12-075518","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"end":"2011-12-31","val":16474988,"accn":"0001193125-12-185910","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26"},{"end":"2011-12-31","val":16474988,"accn":"0001193125-12-325824","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31"},{"end":"2011-12-31","val":16474988,"accn":"0001193125-12-441491","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30"},{"end":"2011-12-31","val":16474988,"accn":"0001193125-13-076843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011Q4I"},{"end":"2012-03-31","val":16569595,"accn":"0001193125-12-185910","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2012Q1I"},{"end":"2012-06-30","val":16639602,"accn":"0001193125-12-325824","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31","frame":"CY2012Q2I"},{"end":"2012-09-30","val":16682186,"accn":"0001193125-12-441491","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3I"},{"end":"2012-12-31","val":16694215,"accn":"0001193125-13-076843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26"},{"end":"2012-12-31","val":16694215,"accn":"0001193125-13-187135","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-30"},{"end":"2012-12-31","val":16694215,"accn":"0001193125-13-310170","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-30"},{"end":"2012-12-31","val":16694215,"accn":"0001193125-13-422857","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-01"},{"end":"2012-12-31","val":16694215,"accn":"0001193125-14-069906","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26","frame":"CY2012Q4I"},{"end":"2013-03-31","val":16753021,"accn":"0001193125-13-187135","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-30","frame":"CY2013Q1I"},{"end":"2013-06-30","val":16827409,"accn":"0001193125-13-310170","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-30","frame":"CY2013Q2I"},{"end":"2013-09-30","val":16900385,"accn":"0001193125-13-422857","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-01","frame":"CY2013Q3I"},{"end":"2013-12-31","val":17015580,"accn":"0001193125-14-069906","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":17015580,"accn":"0001193125-14-159842","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-25"},{"end":"2013-12-31","val":17015580,"accn":"0001410471-14-000023","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-25"},{"end":"2013-12-31","val":17015580,"accn":"0001410471-14-000039","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-28"},{"end":"2013-12-31","val":17015580,"accn":"0001410471-15-000025","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-23","frame":"CY2013Q4I"},{"end":"2014-03-31","val":17125914,"accn":"0001193125-14-159842","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-25","frame":"CY2014Q1I"},{"end":"2014-06-30","val":17180227,"accn":"0001410471-14-000023","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-25","frame":"CY2014Q2I"},{"end":"2014-09-30","val":17215224,"accn":"0001410471-14-000039","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-28","frame":"CY2014Q3I"},{"end":"2014-12-31","val":17242209,"accn":"0001410471-15-000025","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-23"},{"end":"2014-12-31","val":17242209,"accn":"0001410471-15-000069","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-30"},{"end":"2014-12-31","val":17242209,"accn":"0001410471-15-000080","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-30"},{"end":"2014-12-31","val":17242209,"accn":"0001410471-15-000090","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-28","frame":"CY2014Q4I"},{"end":"2015-03-31","val":17384739,"accn":"0001410471-15-000069","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-30","frame":"CY2015Q1I"},{"end":"2015-06-30","val":17414907,"accn":"0001410471-15-000080","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-30","frame":"CY2015Q2I"},{"end":"2015-09-30","val":17451184,"accn":"0001410471-15-000090","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-28","frame":"CY2015Q3I"}]}},"CommonStockSharesOutstanding":{"label":"Common Stock, Shares, Outstanding","description":"Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.","units":{"shares":[{"end":"2010-12-31","val":16287377,"accn":"0001193125-11-200901","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-28"},{"end":"2010-12-31","val":16287377,"accn":"0001193125-11-284127","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27"},{"end":"2010-12-31","val":16287377,"accn":"0001193125-12-075518","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23","frame":"CY2010Q4I"},{"end":"2011-06-30","val":16423085,"accn":"0001193125-11-200901","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-07-28","frame":"CY2011Q2I"},{"end":"2011-09-30","val":16443255,"accn":"0001193125-11-284127","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27","frame":"CY2011Q3I"},{"end":"2011-12-31","val":16474988,"accn":"0001193125-12-075518","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-23"},{"end":"2011-12-31","val":16474988,"accn":"0001193125-12-185910","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26"},{"end":"2011-12-31","val":16474988,"accn":"0001193125-12-325824","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31"},{"end":"2011-12-31","val":16474988,"accn":"0001193125-12-441491","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30"},{"end":"2011-12-31","val":16474988,"accn":"0001193125-13-076843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26","frame":"CY2011Q4I"},{"end":"2012-03-31","val":16569595,"accn":"0001193125-12-185910","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-26","frame":"CY2012Q1I"},{"end":"2012-06-30","val":16639602,"accn":"0001193125-12-325824","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31","frame":"CY2012Q2I"},{"end":"2012-09-30","val":16682186,"accn":"0001193125-12-441491","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3I"},{"end":"2012-12-31","val":16694215,"accn":"0001193125-13-076843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-26"},{"end":"2012-12-31","val":16694215,"accn":"0001193125-13-187135","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-30"},{"end":"2012-12-31","val":16694215,"accn":"0001193125-13-310170","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-30"},{"end":"2012-12-31","val":16694215,"accn":"0001193125-13-422857","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-01"},{"end":"2012-12-31","val":16694215,"accn":"0001193125-14-069906","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26","frame":"CY2012Q4I"},{"end":"2013-03-31","val":16753021,"accn":"0001193125-13-187135","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-30","frame":"CY2013Q1I"},{"end":"2013-06-30","val":16827409,"accn":"0001193125-13-310170","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-30","frame":"CY2013Q2I"},{"end":"2013-09-30","val":16900385,"accn":"0001193125-13-422857","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-01","frame":"CY2013Q3I"},{"end":"2013-12-31","val":17015580,"accn":"0001193125-14-069906","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-26"},{"end":"2013-12-31","val":17015580,"accn":"0001193125-14-159842","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-25"},{"end":"2013-12-31","val":17015580,"accn":"0001410471-14-000023","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-25"},{"end":"2013-12-31","val":17015580,"accn":"0001410471-14-000039","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-28"},{"end":"2013-12-31","val":17015580,"accn":"0001410471-15-000025","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-23","frame":"CY2013Q4I"},{"end":"2014-03-31","val":17125914,"accn":"0001193125-14-159842","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-25","frame":"CY2014Q1I"},{"end":"2014-06-30","val":17180227,"accn":"0001410471-14-000023","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-25","frame":"CY2014Q2I"},{"end":"2014-09-30","val":17215224,"accn":"0001410471-14-000039","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-28","frame":"CY2014Q3I"},{"end":"2014-12-31","val":17242209,"accn":"0001410471-15-000025","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-23"},{"end":"2014-12-31","val":17242209,"accn":"0001410471-15-000069","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-30"},{"end":"2014-12-31","val":17242209,"accn":"0001410471-15-000080","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-30"},{"end":"2014-12-31","val":17242209,"accn":"0001410471-15-000090","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-28","frame":"CY2014Q4I"},{"end":"2015-03-31","val":17384739,"accn":"0001410471-15-000069","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-04-30","frame":"CY2015Q1I"},{"end":"2015-06-30","val":17414907,"accn":"0001410471-15-000080","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-30","frame":"CY2015Q2I"},{"end":"2015-09-30","val":17451184,"accn":"0001410471-15-000090","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-28","frame":"CY2015Q3I"}]}},"CommonStockValue":{"label":"Common Stock, Value, Issued","description":"Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). 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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