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Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.","units":{"USD":[{"end":"2013-06-30","val":2490000,"accn":"0001193125-13-315123","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-01","frame":"CY2013Q2I"},{"end":"2013-09-30","val":3500000,"accn":"0001193125-13-416015","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-29","frame":"CY2013Q3I"}]}},"LongTermDebt":{"label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2013-12-31","val":1000000,"accn":"0001193125-14-106402","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-19","frame":"CY2013Q4I"},{"end":"2015-09-30","val":13500000,"accn":"0001193125-15-364288","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-03","frame":"CY2015Q3I"},{"end":"2015-12-31","val":13500000,"accn":"0001193125-16-575134","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03","frame":"CY2015Q4I"},{"end":"2015-12-31","val":13500000,"accn":"0001193125-16-505257","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"end":"2016-03-31","val":11500000,"accn":"0001193125-16-575134","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03","frame":"CY2016Q1I"}]}},"LongTermDebtAndCapitalLeaseObligations":{"label":"Long-term Debt and Lease Obligation","description":"Amount of long-term debt and lease obligation, classified as noncurrent.","units":{"USD":[{"end":"2013-12-31","val":187000,"accn":"0001193125-15-095358","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-17","frame":"CY2013Q4I"},{"end":"2013-12-31","val":187000,"accn":"0001193125-14-393368","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-03"},{"end":"2013-12-31","val":187000,"accn":"0001193125-14-291545","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-01"},{"end":"2013-12-31","val":187000,"accn":"0001193125-14-180161","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02"},{"end":"2013-12-31","val":187000,"accn":"0001193125-14-106402","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-19"},{"end":"2014-03-31","val":175000,"accn":"0001193125-14-180161","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02","frame":"CY2014Q1I"},{"end":"2014-06-30","val":164000,"accn":"0001193125-14-291545","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-01","frame":"CY2014Q2I"},{"end":"2014-09-30","val":152000,"accn":"0001193125-14-393368","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-03","frame":"CY2014Q3I"}]}},"LongTermDebtAndCapitalLeaseObligationsCurrent":{"label":"Long-term Debt and Lease Obligation, Current","description":"Amount of long-term debt and lease obligation, classified as current.","units":{"USD":[{"end":"2013-12-31","val":1048000,"accn":"0001193125-15-095358","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-17","frame":"CY2013Q4I"},{"end":"2013-12-31","val":1048000,"accn":"0001193125-14-393368","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-03"},{"end":"2013-12-31","val":1048000,"accn":"0001193125-14-291545","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-01"},{"end":"2013-12-31","val":1048000,"accn":"0001193125-14-180161","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02"},{"end":"2013-12-31","val":1048000,"accn":"0001193125-14-106402","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-19"},{"end":"2014-03-31","val":48000,"accn":"0001193125-14-180161","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-02","frame":"CY2014Q1I"},{"end":"2014-06-30","val":48000,"accn":"0001193125-14-291545","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-01","frame":"CY2014Q2I"},{"end":"2014-09-30","val":48000,"accn":"0001193125-14-393368","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-03","frame":"CY2014Q3I"}]}},"LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five","description":"Principal amount of long-term debt and capital lease obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":43000,"accn":"0001193125-14-106402","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-19","frame":"CY2013Q4I"}]}},"LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four","description":"Principal amount of long-term debt and capital lease obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":48000,"accn":"0001193125-14-106402","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-19","frame":"CY2013Q4I"}]}},"LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three","description":"Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":48000,"accn":"0001193125-14-106402","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-19","frame":"CY2013Q4I"}]}},"LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two","description":"Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":48000,"accn":"0001193125-14-106402","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-19","frame":"CY2013Q4I"}]}},"LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months","description":"Principal amount of long-term debt and capital lease obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":1048000,"accn":"0001193125-14-106402","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-19","frame":"CY2013Q4I"}]}},"LongTermDebtCurrent":{"label":"Long-term Debt, Current Maturities","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2014-12-31","val":0,"accn":"0001193125-16-505257","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2014Q4I"},{"end":"2014-12-31","val":0,"accn":"0001193125-15-364288","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-03"},{"end":"2015-09-30","val":13500000,"accn":"0001193125-15-364288","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-03","frame":"CY2015Q3I"},{"end":"2015-12-31","val":13500000,"accn":"0001193125-16-575134","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03","frame":"CY2015Q4I"},{"end":"2015-12-31","val":13500000,"accn":"0001193125-16-505257","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"end":"2016-03-31","val":11500000,"accn":"0001193125-16-575134","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03","frame":"CY2016Q1I"}]}},"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. 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":1000000,"accn":"0001193125-14-106402","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-19","frame":"CY2013Q4I"}]}},"LongTermDebtNoncurrent":{"label":"Long-term Debt, Excluding Current Maturities","description":"Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2015-09-30","val":0,"accn":"0001193125-15-364288","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-03","frame":"CY2015Q3I"},{"end":"2015-12-31","val":0,"accn":"0001193125-16-575134","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03","frame":"CY2015Q4I"},{"end":"2015-12-31","val":0,"accn":"0001193125-16-505257","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15"},{"end":"2016-03-31","val":0,"accn":"0001193125-16-575134","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-03","frame":"CY2016Q1I"}]}},"LossContingencyDamagesSoughtValue":{"label":"Loss Contingency, Damages Sought, Value","description":"The value (monetary amount) of the award the plaintiff seeks in the legal matter.","units":{"USD":[{"end":"2015-03-10","val":18000000,"accn":"0001193125-15-276570","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-04","frame":"CY2015Q1I"}]}},"LossFromCatastrophes":{"label":"Loss from Catastrophes","description":"The charge against earnings in the period for the uninsured portion of a loss from a fire, explosion, or natural disaster (hurricane, earthquake).","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":108000,"accn":"0000950123-11-072196","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-03"},{"start":"2010-04-01","end":"2010-06-30","val":70000,"accn":"0000950123-11-072196","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-03","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":109000,"accn":"0000950123-11-097116","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2010-07-01","end":"2010-09-30","val":1000,"accn":"0000950123-11-097116","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09","frame":"CY2010Q3"},{"start":"2010-01-01","end":"2010-12-31","val":109000,"accn":"0001193125-13-132508","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":109000,"accn":"0001193125-12-143710","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"start":"2011-01-01","end":"2011-06-30","val":-277000,"accn":"0001193125-12-355559","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-01-01","end":"2011-06-30","val":-277000,"accn":"0000950123-11-072196","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-03"},{"start":"2011-04-01","end":"2011-06-30","val":-277000,"accn":"0001193125-12-355559","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2011Q2"},{"start":"2011-04-01","end":"2011-06-30","val":-277000,"accn":"0000950123-11-072196","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-03"},{"start":"2011-06-01","end":"2011-06-30","val":-277000,"accn":"0001193125-12-355559","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"start":"2011-01-01","end":"2011-09-30","val":277000,"accn":"0001193125-12-454481","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-06"},{"start":"2011-01-01","end":"2011-09-30","val":-277000,"accn":"0000950123-11-097116","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09"},{"start":"2011-01-01","end":"2011-12-31","val":-277000,"accn":"0001193125-13-132508","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":-277000,"accn":"0001193125-12-143710","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"}]}},"NetCashProvidedByUsedInFinancingActivities":{"label":"Net Cash Provided by (Used in) Financing Activities","description":"Amount of cash inflow (outflow) from financing activities, including discontinued operations. 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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' equity.","units":{"USD":[{"end":"2010-12-31","val":0,"accn":"0000950123-11-072196","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-03","frame":"CY2010Q4I"},{"end":"2011-06-30","val":0,"accn":"0000950123-11-072196","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-03","frame":"CY2011Q2I"}]}},"PrepaidInsurance":{"label":"Prepaid Insurance","description":"Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if 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