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Excludes amount 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If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"shares":[{"end":"2011-12-31","val":11533000,"accn":"0001104659-12-081494","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2012-12-03","frame":"CY2011Q4I"},{"end":"2012-09-30","val":11545000,"accn":"0001104659-12-081494","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2012-12-03","frame":"CY2012Q3I"}]}},"UnamortizedDebtIssuanceExpense":{"label":"Unamortized Debt Issuance Expense","description":"The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.","units":{"USD":[{"end":"2012-12-31","val":1076000,"accn":"0001047469-13-003382","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-26"},{"end":"2012-12-31","val":1076000,"accn":"0001047469-13-009348","fy":2012,"fp":"FY","form":"10-K/A","filed":"2013-09-27"},{"end":"2012-12-31","val":1076000,"accn":"0001047469-14-002466","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2012Q4I"},{"end":"2013-03-31","val":991000,"accn":"0001104659-13-040811","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-13"},{"end":"2013-03-31","val":991000,"accn":"0001104659-13-072567","fy":2013,"fp":"Q1","form":"10-Q/A","filed":"2013-09-27","frame":"CY2013Q1I"},{"end":"2013-06-30","val":906000,"accn":"0001104659-13-060439","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-06"},{"end":"2013-06-30","val":906000,"accn":"0001104659-13-072568","fy":2013,"fp":"Q2","form":"10-Q/A","filed":"2013-09-27","frame":"CY2013Q2I"},{"end":"2013-09-30","val":821000,"accn":"0001104659-13-084832","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14","frame":"CY2013Q3I"},{"end":"2013-12-31","val":736000,"accn":"0001047469-14-002466","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2013Q4I"},{"end":"2014-12-31","val":29230000,"accn":"0001047469-15-001515","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-02","frame":"CY2014Q4I"}]}},"UnrecognizedTaxBenefits":{"label":"Unrecognized Tax Benefits","description":"Amount of unrecognized tax 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