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Ceded Reinsurance (Components of Reinsurance) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reinsurance Disclosures [Abstract]        
OSLR recoverable $ 232,545us-gaap_ReinsuranceReceivablesCaseBasis $ 225,796us-gaap_ReinsuranceReceivablesCaseBasis    
IBNR recoverable 1,107,711us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims 1,008,708us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims    
Reinsurance recoverable 1,340,256us-gaap_ReinsuranceRecoverables 1,234,504us-gaap_ReinsuranceRecoverables 1,141,110us-gaap_ReinsuranceRecoverables 1,002,919us-gaap_ReinsuranceRecoverables
Reinsurance recoverable on paid losses $ 86,075us-gaap_ReinsuranceReceivablesPaidLossesRecoverable $ 76,099us-gaap_ReinsuranceReceivablesPaidLossesRecoverable