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Shares issued include shares outstanding and shares held in the treasury.","units":{"shares":[{"end":"2010-12-31","val":15652845,"accn":"0000058592-12-000007","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23","frame":"CY2010Q4I"},{"end":"2010-12-31","val":15652845,"accn":"0000058592-11-000026","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":15652845,"accn":"0000058592-11-000020","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"end":"2011-06-30","val":15777711,"accn":"0000058592-11-000020","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2011Q2I"},{"end":"2011-09-30","val":15777711,"accn":"0000058592-11-000026","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":15777711,"accn":"0001140361-13-014416","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2011-12-31","val":15777711,"accn":"0001140361-12-046850","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13"},{"end":"2011-12-31","val":15777711,"accn":"0000058592-12-000029","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":15777711,"accn":"0000058592-12-000017","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":15777711,"accn":"0000058592-12-000007","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23"},{"end":"2012-03-31","val":15777711,"accn":"0000058592-12-000017","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":15838879,"accn":"0000058592-12-000029","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":15838879,"accn":"0001140361-12-046850","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13","frame":"CY2012Q3I"},{"end":"2012-12-31","val":15838879,"accn":"0001140361-14-014795","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2012Q4I"},{"end":"2012-12-31","val":15838879,"accn":"0001140361-13-042387","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14"},{"end":"2012-12-31","val":15838879,"accn":"0001140361-13-032558","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14"},{"end":"2012-12-31","val":15838879,"accn":"0001140361-13-020964","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":15838879,"accn":"0001140361-13-014416","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2013-03-31","val":15838879,"accn":"0001140361-13-020964","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":15838879,"accn":"0001140361-13-032558","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14","frame":"CY2013Q2I"},{"end":"2013-09-30","val":15838879,"accn":"0001140361-13-042387","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14","frame":"CY2013Q3I"},{"end":"2013-12-31","val":15838879,"accn":"0001140361-15-013663","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2013-12-31","val":15838879,"accn":"0001140361-14-042254","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"end":"2013-12-31","val":15838879,"accn":"0001140361-14-032881","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":15838879,"accn":"0001140361-14-021728","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15"},{"end":"2013-12-31","val":15838879,"accn":"0001140361-14-014795","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2014-03-31","val":15845879,"accn":"0001140361-14-021728","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2014Q1I"},{"end":"2014-06-30","val":15862479,"accn":"0001140361-14-032881","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":15867813,"accn":"0001140361-14-042254","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14","frame":"CY2014Q3I"},{"end":"2014-12-31","val":15916308,"accn":"0001140361-15-041166","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13","frame":"CY2014Q4I"},{"end":"2014-12-31","val":15916308,"accn":"0001140361-15-032321","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2014-12-31","val":15916308,"accn":"0001140361-15-020343","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15"},{"end":"2014-12-31","val":15916308,"accn":"0001140361-15-013663","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2015-03-31","val":17028006,"accn":"0001140361-15-020343","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2015Q1I"},{"end":"2015-06-30","val":17061695,"accn":"0001140361-15-032321","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":17102195,"accn":"0001140361-15-041166","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13","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":13528958,"accn":"0000058592-12-000007","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23","frame":"CY2010Q4I"},{"end":"2010-12-31","val":13528958,"accn":"0000058592-11-000026","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":13528958,"accn":"0000058592-11-000020","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"end":"2011-06-30","val":13653824,"accn":"0000058592-11-000020","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2011Q2I"},{"end":"2011-09-30","val":13653824,"accn":"0000058592-11-000026","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":13653824,"accn":"0001140361-13-014416","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2011-12-31","val":13653824,"accn":"0001140361-12-046850","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13"},{"end":"2011-12-31","val":13653824,"accn":"0000058592-12-000029","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":13653824,"accn":"0000058592-12-000017","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":13653824,"accn":"0000058592-12-000007","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23"},{"end":"2012-03-31","val":13653824,"accn":"0000058592-12-000017","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":13714992,"accn":"0000058592-12-000029","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":13714992,"accn":"0001140361-12-046850","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13","frame":"CY2012Q3I"},{"end":"2012-12-31","val":13714992,"accn":"0001140361-14-014795","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2012Q4I"},{"end":"2012-12-31","val":13714992,"accn":"0001140361-13-042387","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14"},{"end":"2012-12-31","val":13714992,"accn":"0001140361-13-032558","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14"},{"end":"2012-12-31","val":13714992,"accn":"0001140361-13-020964","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":13714992,"accn":"0001140361-13-014416","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2013-03-31","val":13714992,"accn":"0001140361-13-020964","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":13714992,"accn":"0001140361-13-032558","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14","frame":"CY2013Q2I"},{"end":"2013-09-30","val":13714992,"accn":"0001140361-13-042387","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14","frame":"CY2013Q3I"},{"end":"2013-12-31","val":13714992,"accn":"0001140361-15-013663","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2013-12-31","val":13714992,"accn":"0001140361-14-042254","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"end":"2013-12-31","val":13714992,"accn":"0001140361-14-032881","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":13714992,"accn":"0001140361-14-021728","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15"},{"end":"2013-12-31","val":13714992,"accn":"0001140361-14-014795","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2014-03-31","val":13721992,"accn":"0001140361-14-021728","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2014Q1I"},{"end":"2014-06-30","val":13738592,"accn":"0001140361-14-032881","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":13743926,"accn":"0001140361-14-042254","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14","frame":"CY2014Q3I"},{"end":"2014-12-31","val":13792421,"accn":"0001140361-15-041166","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13","frame":"CY2014Q4I"},{"end":"2014-12-31","val":13792421,"accn":"0001140361-15-032321","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2014-12-31","val":13792421,"accn":"0001140361-15-020343","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15"},{"end":"2014-12-31","val":13792421,"accn":"0001140361-15-013663","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2015-03-31","val":14904119,"accn":"0001140361-15-020343","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2015Q1I"},{"end":"2015-06-30","val":14937808,"accn":"0001140361-15-032321","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":14978308,"accn":"0001140361-15-041166","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13","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' equity.","units":{"USD":[{"end":"2010-12-31","val":157000,"accn":"0000058592-12-000007","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23","frame":"CY2010Q4I"},{"end":"2010-12-31","val":157000,"accn":"0000058592-11-000026","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":157000,"accn":"0000058592-11-000020","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"end":"2011-06-30","val":158000,"accn":"0000058592-11-000020","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2011Q2I"},{"end":"2011-09-30","val":158000,"accn":"0000058592-11-000026","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":158000,"accn":"0001140361-13-014416","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2011-12-31","val":158000,"accn":"0001140361-12-046850","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13"},{"end":"2011-12-31","val":158000,"accn":"0000058592-12-000029","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":158000,"accn":"0000058592-12-000017","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":158000,"accn":"0000058592-12-000007","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23"},{"end":"2012-03-31","val":158000,"accn":"0000058592-12-000017","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":158000,"accn":"0000058592-12-000029","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":158000,"accn":"0001140361-12-046850","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13","frame":"CY2012Q3I"},{"end":"2012-12-31","val":158000,"accn":"0001140361-14-014795","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2012Q4I"},{"end":"2012-12-31","val":158000,"accn":"0001140361-13-042387","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14"},{"end":"2012-12-31","val":158000,"accn":"0001140361-13-032558","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14"},{"end":"2012-12-31","val":158000,"accn":"0001140361-13-020964","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":158000,"accn":"0001140361-13-014416","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2013-03-31","val":158000,"accn":"0001140361-13-020964","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":158000,"accn":"0001140361-13-032558","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14","frame":"CY2013Q2I"},{"end":"2013-09-30","val":158000,"accn":"0001140361-13-042387","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14","frame":"CY2013Q3I"},{"end":"2013-12-31","val":158000,"accn":"0001140361-15-013663","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2013-12-31","val":158000,"accn":"0001140361-14-042254","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"end":"2013-12-31","val":158000,"accn":"0001140361-14-032881","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":158000,"accn":"0001140361-14-021728","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15"},{"end":"2013-12-31","val":158000,"accn":"0001140361-14-014795","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2014-03-31","val":158000,"accn":"0001140361-14-021728","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2014Q1I"},{"end":"2014-06-30","val":159000,"accn":"0001140361-14-032881","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":159000,"accn":"0001140361-14-042254","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14","frame":"CY2014Q3I"},{"end":"2014-12-31","val":159000,"accn":"0001140361-15-041166","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13","frame":"CY2014Q4I"},{"end":"2014-12-31","val":159000,"accn":"0001140361-15-032321","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14"},{"end":"2014-12-31","val":159000,"accn":"0001140361-15-020343","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15"},{"end":"2014-12-31","val":159000,"accn":"0001140361-15-013663","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2015-03-31","val":170000,"accn":"0001140361-15-020343","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2015Q1I"},{"end":"2015-06-30","val":171000,"accn":"0001140361-15-032321","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-14","frame":"CY2015Q2I"},{"end":"2015-09-30","val":171000,"accn":"0001140361-15-041166","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-13","frame":"CY2015Q3I"}]}},"ComprehensiveIncomeNetOfTax":{"label":"Comprehensive 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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' 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