Postretirement Benefits (Details)	12 Months Ended		12 Months Ended
	Dec. 31, 2011 assumption	Jun. 30, 2011 Retiree health benefit plan Minimum Y	Dec. 31, 2011 Employee pension plan	Dec. 31, 2010 Employee pension plan	Dec. 31, 2009 Employee pension plan	Dec. 31, 2011 Supplemental employee retirement plan (SERP)	Dec. 31, 2010 Supplemental employee retirement plan (SERP)	Dec. 31, 2009 Supplemental employee retirement plan (SERP)
Postretirement Benefits
Eligible participation age, at plan curtailment date (in years)		60
Eligible participation years of service, at plan curtailment date (in years)		15
Postretirement benefit expenses reimbursed to Indemnity from the Exchange and EFL (as a percent)	57.00%
Assumptions used to determine benefit obligations:
Discount rate (as a percent)			4.99%	5.69%	6.11%
Pre-retirement discount rate (as a percent)						4.99%	5.69%	6.11%
Post-retirement discount rate (as a percent)						4.49%	5.19%	5.00%
Expected return on plan assets (as a percent)			8.00%	8.00%	8.25%
Rate of compensation increase (as a percent)			4.15%	4.15%	4.15%	6.00%	6.00%	6.00%
Assumptions used to determine net periodic benefit cost
Discount rate (as a percent)			5.69%	6.11%	6.06%
Pre-retirement discount rate (as a percent)						5.69%	6.11%	6.06%
Post-retirement discount rate (as a percent)						5.19%	5.00%	5.00%
Expected return on plan assets (as a percent)			8.00%	8.00%	8.25%
Rate of compensation increase (as a percent)			4.15%	4.15%	4.15%	6.00%	6.00%	6.00%
Number of economic assumptions that have the most impact on the postretirement benefit expense	2