Reinsurance (Schedule Of Loss Portfolio Transfer Reinsurance Agreements, Net Insurance Exposures And Reserves Were Transferred To An Affiliate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2017
Reinsurance [Line Items]
Amount of Transfer		$ 1,000,000
Effective Date 10/01/2001 [Member]
Reinsurance [Line Items]
Transferring Company	Everest Re (Belgium Branch)
Assuming Company	Bermuda Re
% of Business Transfer	100.00%
Covered Period of Transfer	All years
Effective Date 10/01/2008 [Member]
Reinsurance [Line Items]
Transferring Company	Everest Re
Assuming Company	Bermuda Re
Amount of Transfer	$ 747,022
Covered Period of Transfer	01/01/2002-12/31/2007
Effective Date 12/31/2017 [Member]
Reinsurance [Line Items]
Transferring Company	Everest Re
Assuming Company	Bermuda Re
Amount of Transfer	$ 970,000
Covered Period of Transfer	All years