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Common stock represent the ownership interest in a 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This item includes treasury stock repurchased by the entity. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":128167000,"accn":"0000766561-14-000013","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06","frame":"CY2013Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":1353000,"accn":"0000766561-14-000013","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06","frame":"CY2013Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. 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from Lines of Credit","description":"Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0000766561-12-000073","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-11-09","frame":"CY2009"},{"start":"2009-01-01","end":"2009-12-31","val":0,"accn":"0000766561-12-000017","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-07"},{"start":"2010-01-01","end":"2010-06-30","val":9900000,"accn":"0000766561-11-000032","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-04"},{"start":"2010-01-01","end":"2010-09-30","val":19900000,"accn":"0000766561-11-000048","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-02"},{"start":"2010-01-01","end":"2010-12-31","val":24400000,"accn":"0000766561-13-000015","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":24400000,"accn":"0000766561-12-000073","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-11-09"},{"start":"2010-01-01","end":"2010-12-31","val":24400000,"accn":"0000766561-12-000017","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-07"},{"start":"2011-01-01","end":"2011-03-31","val":16000000,"accn":"0000766561-12-000075","fy":2012,"fp":"Q1","form":"10-Q/A","filed":"2012-11-09","frame":"CY2011Q1"},{"start":"2011-01-01","end":"2011-03-31","val":16000000,"accn":"0000766561-12-000026","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-01"},{"start":"2011-01-01","end":"2011-06-30","val":25700000,"accn":"0000766561-12-000077","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-11-09"},{"start":"2011-01-01","end":"2011-06-30","val":25700000,"accn":"0000766561-12-000049","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-02"},{"start":"2011-01-01","end":"2011-06-30","val":25700000,"accn":"0000766561-11-000032","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-04"},{"start":"2011-01-01","end":"2011-09-30","val":147700000,"accn":"0000766561-12-000083","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2011-01-01","end":"2011-09-30","val":147700000,"accn":"0000766561-11-000048","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-02"},{"start":"2011-01-01","end":"2011-12-31","val":147700000,"accn":"0000766561-14-000013","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":147700000,"accn":"0000766561-13-000015","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2011-01-01","end":"2011-12-31","val":147700000,"accn":"0000766561-12-000073","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-11-09"},{"start":"2011-01-01","end":"2011-12-31","val":147700000,"accn":"0000766561-12-000017","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-07"},{"start":"2012-01-01","end":"2012-03-31","val":22000000,"accn":"0000766561-13-000029","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-01","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-03-31","val":22000000,"accn":"0000766561-12-000075","fy":2012,"fp":"Q1","form":"10-Q/A","filed":"2012-11-09"},{"start":"2012-01-01","end":"2012-03-31","val":22000000,"accn":"0000766561-12-000026","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-01"},{"start":"2012-01-01","end":"2012-06-30","val":22000000,"accn":"0000766561-13-000049","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"start":"2012-01-01","end":"2012-06-30","val":22000000,"accn":"0000766561-12-000077","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-11-09"},{"start":"2012-01-01","end":"2012-06-30","val":22000000,"accn":"0000766561-12-000049","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-02"},{"start":"2012-01-01","end":"2012-09-30","val":22000000,"accn":"0000766561-13-000062","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-05"},{"start":"2012-01-01","end":"2012-09-30","val":22000000,"accn":"0000766561-12-000083","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09"},{"start":"2012-01-01","end":"2012-12-31","val":22000000,"accn":"0000766561-14-000013","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":22000000,"accn":"0000766561-13-000015","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-07"},{"start":"2013-01-01","end":"2013-03-31","val":0,"accn":"0000766561-13-000029","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-01","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":0,"accn":"0000766561-13-000049","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"start":"2013-01-01","end":"2013-09-30","val":0,"accn":"0000766561-13-000062","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-05"},{"start":"2013-01-01","end":"2013-12-31","val":19670000,"accn":"0000766561-14-000013","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-06","frame":"CY2013"}]}},"ProceedsFromSaleAndMaturityOfMarketableSecurities":{"label":"Proceeds 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Q1","form":"10-Q","filed":"2014-05-02","frame":"CY2014Q1I"},{"end":"2014-06-30","val":49844000,"accn":"0000766561-14-000045","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-30","frame":"CY2014Q2I"}]}},"StockIssuedDuringPeriodSharesStockOptionsExercised":{"label":"Share-based 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