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Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims.","units":{"USD":[{"end":"2009-12-31","val":160955000,"accn":"0001193125-13-136843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2009Q4I"},{"end":"2010-12-31","val":158787000,"accn":"0001193125-13-136843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"end":"2010-12-31","val":158787000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2010Q4I"},{"end":"2011-12-31","val":105326000,"accn":"0001193125-13-136843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"end":"2011-12-31","val":105326000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2011-12-31","val":105326000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2011Q4I"},{"end":"2012-12-31","val":71688000,"accn":"0001193125-13-136843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"end":"2012-12-31","val":71688000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2012-12-31","val":71688000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2012Q4I"},{"end":"2013-12-31","val":61223000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2013-12-31","val":61223000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":46331000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LineOfCredit":{"label":"Long-term Line of Credit","description":"The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. 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Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2012-12-31","val":108989000,"accn":"0001193125-13-136843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"end":"2012-12-31","val":176165000,"accn":"0001193125-13-222416","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":176165000,"accn":"0001193125-13-334884","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14"},{"end":"2012-12-31","val":176165000,"accn":"0001193125-13-442271","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14"},{"end":"2012-12-31","val":176165000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2012Q4I"},{"end":"2013-03-31","val":183290000,"accn":"0001193125-13-222416","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":184785000,"accn":"0001193125-13-334884","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14","frame":"CY2013Q2I"},{"end":"2013-09-30","val":131814000,"accn":"0001193125-13-442271","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14","frame":"CY2013Q3I"},{"end":"2013-12-31","val":127563000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2013-12-31","val":127563000,"accn":"0001193125-14-201359","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15"},{"end":"2013-12-31","val":127563000,"accn":"0001193125-14-310191","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":127563000,"accn":"0001193125-14-413489","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"end":"2013-12-31","val":127563000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-03-31","val":128209000,"accn":"0001193125-14-201359","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2014Q1I"},{"end":"2014-06-30","val":123966000,"accn":"0001193125-14-310191","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":124238000,"accn":"0001193125-14-413489","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14","frame":"CY2014Q3I"},{"end":"2014-12-31","val":123341000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2014-12-31","val":123341000,"accn":"0001564590-15-004441","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2014Q4I"},{"end":"2015-03-31","val":124512000,"accn":"0001564590-15-004441","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2015Q1I"}]}},"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":"2012-12-31","val":1191000,"accn":"0001193125-13-136843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"},{"end":"2013-12-31","val":6500000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":15000000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"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. 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":13650000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","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 third 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":13500000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":16566000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","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 second 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":"2012-12-31","val":107798000,"accn":"0001193125-13-136843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2012Q4I"},{"end":"2013-12-31","val":15000000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":13500000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"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. 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Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. 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Realized and Unrealized Gain (Loss) on Trading Securities","description":"The sum of the realized and unrealized net gain (loss) on trading securities during the period.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":177000,"accn":"0001193125-13-136843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2010"}]}},"NotesPayable":{"label":"Notes Payable","description":"Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.","units":{"USD":[{"end":"2010-12-31","val":76873000,"accn":"0001193125-11-222946","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15"},{"end":"2010-12-31","val":76873000,"accn":"0001193125-11-311394","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":76873000,"accn":"0001193125-12-143527","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30","frame":"CY2010Q4I"},{"end":"2011-06-30","val":76865000,"accn":"0001193125-11-222946","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-15","frame":"CY2011Q2I"},{"end":"2011-09-30","val":76861000,"accn":"0001193125-11-311394","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":76857000,"accn":"0001193125-12-143527","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-30"},{"end":"2011-12-31","val":76857000,"accn":"0001193125-12-234462","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":76857000,"accn":"0001193125-12-355334","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14"},{"end":"2011-12-31","val":76857000,"accn":"0001193125-12-475905","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-20"},{"end":"2011-12-31","val":76857000,"accn":"0001193125-12-477589","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2012-11-20"},{"end":"2011-12-31","val":76857000,"accn":"0001193125-13-136843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01","frame":"CY2011Q4I"},{"end":"2012-03-31","val":76853000,"accn":"0001193125-12-234462","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2012-06-30","val":76849000,"accn":"0001193125-12-355334","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":76845000,"accn":"0001193125-12-475905","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-20"},{"end":"2012-09-30","val":76845000,"accn":"0001193125-12-477589","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2012-11-20","frame":"CY2012Q3I"},{"end":"2012-12-31","val":76842000,"accn":"0001193125-13-136843","fy":2012,"fp":"FY","form":"10-K","filed":"2013-04-01"},{"end":"2012-12-31","val":76842000,"accn":"0001193125-13-222416","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15"},{"end":"2012-12-31","val":76842000,"accn":"0001193125-13-334884","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14"},{"end":"2012-12-31","val":76842000,"accn":"0001193125-13-442271","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14"},{"end":"2012-12-31","val":76842000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2012Q4I"},{"end":"2013-03-31","val":76838000,"accn":"0001193125-13-222416","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-15","frame":"CY2013Q1I"},{"end":"2013-06-30","val":76835000,"accn":"0001193125-13-334884","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14","frame":"CY2013Q2I"},{"end":"2013-09-30","val":76831000,"accn":"0001193125-13-442271","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14","frame":"CY2013Q3I"},{"end":"2013-12-31","val":76828000,"accn":"0001193125-14-123886","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31"},{"end":"2013-12-31","val":76828000,"accn":"0001193125-14-201359","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15"},{"end":"2013-12-31","val":76828000,"accn":"0001193125-14-310191","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14"},{"end":"2013-12-31","val":76828000,"accn":"0001193125-14-413489","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14"},{"end":"2013-12-31","val":76828000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013Q4I"},{"end":"2014-03-31","val":76825000,"accn":"0001193125-14-201359","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-15","frame":"CY2014Q1I"},{"end":"2014-06-30","val":76822000,"accn":"0001193125-14-310191","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-14","frame":"CY2014Q2I"},{"end":"2014-09-30","val":76819000,"accn":"0001193125-14-413489","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-14","frame":"CY2014Q3I"},{"end":"2014-12-31","val":76815000,"accn":"0001564590-15-002289","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"end":"2014-12-31","val":76815000,"accn":"0001564590-15-004441","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2014Q4I"},{"end":"2015-03-31","val":76813000,"accn":"0001564590-15-004441","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-15","frame":"CY2015Q1I"}]}},"NotesReceivableGross":{"label":"Financing 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