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Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting 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Alternate caption for the concept is permanent 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Excludes employee stock ownership plan (ESOP).","units":{"USD":[{"start":"2011-01-01","end":"2011-06-30","val":137476,"accn":"0000711665-11-000020","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"}]}},"StockIssuedDuringPeriodValueStockOptionsExercised":{"label":"Stock Issued During Period, Value, Stock Options Exercised","description":"Value of stock issued as a result of the exercise of stock options.","units":{"USD":[{"start":"2011-01-01","end":"2011-06-30","val":1036,"accn":"0000711665-11-000020","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"start":"2011-01-01","end":"2011-09-30","val":1036,"accn":"0000711665-11-000025","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"start":"2011-01-01","end":"2011-12-31","val":410000,"accn":"0000711665-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"start":"2011-01-01","end":"2011-12-31","val":410000,"accn":"0000711665-13-000010","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"start":"2011-01-01","end":"2011-12-31","val":410000,"accn":"0000711665-13-000015","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-05-10"},{"start":"2011-01-01","end":"2011-12-31","val":410000,"accn":"0001140361-14-012913","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2011"},{"start":"2012-01-01","end":"2012-03-31","val":27000,"accn":"0000711665-12-000014","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1"},{"start":"2012-01-01","end":"2012-06-30","val":39000,"accn":"0000711665-12-000026","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2012-01-01","end":"2012-09-30","val":54000,"accn":"0000711665-12-000038","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-13"},{"start":"2012-01-01","end":"2012-12-31","val":67000,"accn":"0000711665-13-000010","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"start":"2012-01-01","end":"2012-12-31","val":67000,"accn":"0000711665-13-000015","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-05-10"},{"start":"2012-01-01","end":"2012-12-31","val":67000,"accn":"0001140361-14-012913","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"start":"2012-01-01","end":"2012-12-31","val":67000,"accn":"0000711665-15-000017","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2012"},{"start":"2013-01-01","end":"2013-03-31","val":13000,"accn":"0000711665-13-000018","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1"},{"start":"2013-01-01","end":"2013-06-30","val":23000,"accn":"0000711665-13-000032","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09"},{"start":"2013-01-01","end":"2013-09-30","val":23000,"accn":"0000711665-13-000035","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-08"},{"start":"2013-01-01","end":"2013-12-31","val":23000,"accn":"0001140361-14-012913","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"start":"2013-01-01","end":"2013-12-31","val":23000,"accn":"0000711665-15-000017","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2013"}]}},"StockRedeemedOrCalledDuringPeriodValue":{"label":"Stock Redeemed or Called During Period, Value","description":"Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.","units":{"USD":[{"start":"2018-01-01","end":"2018-03-31","val":677000,"accn":"0001615774-18-004160","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-21","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":677000,"accn":"0001615774-18-008375","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-20"},{"start":"2018-01-01","end":"2018-09-30","val":681000,"accn":"0001615774-18-012687","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14"}]}},"StockRepurchasedAndRetiredDuringPeriodValue":{"label":"Stock Repurchased and Retired During Period, Value","description":"Equity impact of the value of stock that has been repurchased and retired during the period. 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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 stock.","units":{"shares":[{"start":"2011-01-01","end":"2011-12-31","val":16056,"accn":"0000711665-12-000006","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"start":"2011-01-01","end":"2011-12-31","val":16056,"accn":"0000711665-13-000010","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18"},{"start":"2011-01-01","end":"2011-12-31","val":16056,"accn":"0000711665-13-000015","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-05-10"},{"start":"2011-01-01","end":"2011-12-31","val":16056,"accn":"0001140361-14-012913","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":16056,"accn":"0000711665-15-000017","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2012"}]}},"StockRepurchasedDuringPeriodValue":{"label":"Stock Repurchased During Period, Value","description":"Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. 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