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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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A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. 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Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.","units":{"USD":[{"end":"2008-12-31","val":67411000,"accn":"0001193125-11-050288","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-01","frame":"CY2008Q4I"},{"end":"2010-03-31","val":73743000,"accn":"0001193125-11-132422","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-09","frame":"CY2010Q1I"},{"end":"2010-06-30","val":73743000,"accn":"0001193125-10-181285","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-06","frame":"CY2010Q2I"},{"end":"2010-09-30","val":73743000,"accn":"0001193125-10-252178","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-08","frame":"CY2010Q3I"},{"end":"2010-12-31","val":73743000,"accn":"0001193125-11-050288","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-01","frame":"CY2010Q4I"}]}},"NoncashOrPartNoncashAcquisitionInvestmentsAcquired1":{"label":"Noncash or Part Noncash Acquisition, Investments Acquired","description":"\"The amount of investments that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"\"Part noncash\"\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.\"","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":73743000,"accn":"0001193125-11-214561","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"start":"2010-01-01","end":"2010-06-30","val":73743000,"accn":"0001193125-11-268035","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-10-11"},{"start":"2010-01-01","end":"2010-09-30","val":73743000,"accn":"0001193125-11-300061","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"start":"2009-12-31","end":"2010-12-31","val":73743000,"accn":"0001193125-13-084204","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":73743000,"accn":"0001193125-12-085595","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28"},{"start":"2012-01-01","end":"2012-03-31","val":275650000,"accn":"0001193125-12-218924","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08"},{"start":"2012-01-01","end":"2012-03-31","val":275650000,"accn":"0001193125-13-209981","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-09","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":275650000,"accn":"0001193125-12-346204","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09"},{"start":"2012-01-01","end":"2012-06-30","val":275650000,"accn":"0001193125-13-326627","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"start":"2012-01-01","end":"2012-09-30","val":275650000,"accn":"0001193125-12-463332","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-01-01","end":"2012-09-30","val":275650000,"accn":"0001193125-13-435140","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08"},{"start":"2012-01-01","end":"2012-12-31","val":275650000,"accn":"0001193125-13-084204","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-28"},{"start":"2012-01-01","end":"2012-12-31","val":275650000,"accn":"0001193125-14-080493","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-03","frame":"CY2012"},{"start":"2015-01-01","end":"2015-12-31","val":327152000,"accn":"0000714310-18-000104","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000714310-18-000104","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":0,"accn":"0000714310-18-000104","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2017"}]}},"NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed":{"label":"Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) (Deprecated 2011-01-31)","description":"The net book value of a nonmonetary asset transferred or exchanged in connection with the acquisition of a business or asset in a noncash transaction. 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Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the 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Y","form":"10-K","filed":"2018-03-01","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":323470000,"accn":"0000714310-17-000128","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08"},{"start":"2017-01-01","end":"2017-03-31","val":323470000,"accn":"0000714310-18-000143","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":707654000,"accn":"0000714310-17-000158","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-07"},{"start":"2017-01-01","end":"2017-09-30","val":1200913000,"accn":"0000714310-17-000178","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07"},{"start":"2017-01-01","end":"2017-12-31","val":1418073000,"accn":"0000714310-18-000104","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":475346000,"accn":"0000714310-18-000143","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2018Q1"}]}},"PaymentsForRepurchaseOfCommonStock":{"label":"Payments 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