Related-Party Transactions (Loss Portfolio Transfer Reinsurance Agreements, Net Insurance Exposures And Reserves Were Transferred To An Affiliate) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Mt. McKinley [Member]
Effective Date	Sep. 19, 2000
Assuming Company	Bermuda Re
% of Business Transfer	100.00%
Covered Period of Transfer	All years
Everest Re (Belgium Branch) [Member]
Effective Date	Oct. 01, 2001
Assuming Company	Bermuda Re
% of Business Transfer	100.00%
Covered Period of Transfer	All years
Everest Re [Member]
Effective Date	Oct. 01, 2008
Assuming Company	Bermuda Re
Amount of Business Transfer	747,022
Covered Period of Transfer	01/01/2002-12/31/2007