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Summary of Significant Accounting Policies (Schedule Of Uncollectible Reinsurance Recoverable And Premium Receivables) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Summary Of Significant Accounting Policies [Abstract]    
Reinsurance Recoverable And Premium Receivables $ 29,153cik0000914748_ReinsuranceRecoverableAndPremiumReceivables $ 29,516cik0000914748_ReinsuranceRecoverableAndPremiumReceivables