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This element refers to the gain (loss) included in 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on Sale of Investments","description":"The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the 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Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and 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Receivable, Credit Loss Expense (Reversal)","description":"Amount of expense (reversal of expense) for expected credit loss on accounts receivable.","units":{"USD":[{"start":"2015-01-01","end":"2015-12-31","val":1202000,"accn":"0000278041-16-000093","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-03","frame":"CY2015"}]}},"ReceivablesNetCurrent":{"label":"Receivables, Net, Current","description":"The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.","units":{"USD":[{"end":"2010-12-31","val":16474000,"accn":"0000278041-11-000077","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03","frame":"CY2010Q4I"},{"end":"2010-12-31","val":16474000,"accn":"0000278041-11-000061","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-04"},{"end":"2011-06-30","val":21715000,"accn":"0000278041-11-000061","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-04","frame":"CY2011Q2I"},{"end":"2011-09-30","val":19044000,"accn":"0000278041-11-000077","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03","frame":"CY2011Q3I"}]}},"ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax":{"label":"Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax","description":"Amount before tax of reclassification adjustments of other comprehensive income 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of Long-term Debt","description":"The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if 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Issued During Period, Value, New Issues","description":"Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.","units":{"USD":[{"start":"2013-01-01","end":"2013-03-31","val":23438000,"accn":"0000278041-13-000043","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":23480000,"accn":"0000278041-13-000050","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"start":"2013-01-01","end":"2013-09-30","val":53336000,"accn":"0000278041-13-000063","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08"},{"start":"2013-01-01","end":"2013-12-31","val":53333000,"accn":"0000278041-15-000025","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2013"},{"start":"2013-01-01","end":"2013-12-31","val":53333000,"accn":"0000278041-14-000021","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-13"}]}},"StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures":{"label":"Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures","description":"Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.","units":{"USD":[{"start":"2009-01-01","end":"2009-12-31","val":1840000,"accn":"0000278041-12-000012","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-09","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":1737000,"accn":"0000278041-13-000029","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-11","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":1737000,"accn":"0000278041-12-000012","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-09"},{"start":"2011-01-01","end":"2011-12-31","val":1026000,"accn":"0000278041-14-000021","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-13","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":1026000,"accn":"0000278041-13-000029","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-11"},{"start":"2011-01-01","end":"2011-12-31","val":1026000,"accn":"0000278041-12-000012","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-09"},{"start":"2012-01-01","end":"2012-12-31","val":558000,"accn":"0000278041-15-000025","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":558000,"accn":"0000278041-14-000021","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-13"},{"start":"2012-01-01","end":"2012-12-31","val":558000,"accn":"0000278041-13-000029","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-11"},{"start":"2013-01-01","end":"2013-12-31","val":1046000,"accn":"0000278041-15-000025","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2013"},{"start":"2013-01-01","end":"2013-12-31","val":1046000,"accn":"0000278041-14-000021","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-13"},{"start":"2014-01-01","end":"2014-12-31","val":896000,"accn":"0000278041-16-000093","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-03","frame":"CY2014"},{"start":"2014-01-01","end":"2014-12-31","val":896000,"accn":"0000278041-15-000025","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12"},{"start":"2015-01-01","end":"2015-12-31","val":577000,"accn":"0000278041-16-000093","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-03","frame":"CY2015"}]}},"StockIssuedDuringPeriodValueShareBasedCompensation":{"label":"Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture","description":"Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).","units":{"USD":[{"start":"2012-01-01","end":"2012-06-30","val":125000,"accn":"0000278041-12-000038","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-07"},{"start":"2012-01-01","end":"2012-09-30","val":-222000,"accn":"0000278041-12-000052","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-07"},{"start":"2013-01-01","end":"2013-03-31","val":108000,"accn":"0000278041-13-000043","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-03","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":347000,"accn":"0000278041-13-000050","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"start":"2013-01-01","end":"2013-09-30","val":648000,"accn":"0000278041-13-000063","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08"},{"start":"2014-01-01","end":"2014-03-31","val":447000,"accn":"0000278041-14-000042","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-07","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":192000,"accn":"0000278041-14-000050","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-05"},{"start":"2014-01-01","end":"2014-09-30","val":544000,"accn":"0000278041-14-000065","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-07"},{"start":"2015-01-01","end":"2015-03-31","val":2000,"accn":"0000278041-15-000035","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":199000,"accn":"0000278041-15-000054","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-03"},{"start":"2015-01-01","end":"2015-09-30","val":437000,"accn":"0000278041-15-000061","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-16"},{"start":"2016-01-01","end":"2016-03-31","val":222000,"accn":"0000278041-16-000109","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-06","frame":"CY2016Q1"}]}},"StockRepurchasedDuringPeriodShares":{"label":"Stock Repurchased During Period, Shares","description":"Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury 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