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Reinsurance (Effect Of Reinsurance And Retrocessional Activity On Premiums Written And Earned And On Net Claims And Claim Expenses) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Premiums written |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | $ 76,511 us-gaap_DirectPremiumsWritten | $ 54,334 us-gaap_DirectPremiumsWritten | $ 36,367 us-gaap_DirectPremiumsWritten
Assumed |  |  |  |  |  |  |  |  | 1,474,061 us-gaap_AssumedPremiumsWritten | 1,551,078 us-gaap_AssumedPremiumsWritten | 1,515,224 us-gaap_AssumedPremiumsWritten
Ceded |  |  |  |  |  |  |  |  | (482,336)us-gaap_CededPremiumsWritten | (401,465)us-gaap_CededPremiumsWritten | (448,934)us-gaap_CededPremiumsWritten
Net premiums written | 111,769 us-gaap_PremiumsWrittenNet | 159,713 us-gaap_PremiumsWrittenNet | 346,407 us-gaap_PremiumsWrittenNet | 450,347 us-gaap_PremiumsWrittenNet | 80,784 us-gaap_PremiumsWrittenNet | 127,241 us-gaap_PremiumsWrittenNet | 559,109 us-gaap_PremiumsWrittenNet | 436,813 us-gaap_PremiumsWrittenNet | 1,068,236 us-gaap_PremiumsWrittenNet | 1,203,947 us-gaap_PremiumsWrittenNet | 1,102,657 us-gaap_PremiumsWrittenNet
Premiums earned |  |  |  |  |  |  |  |  |  |  |
Direct |  |  |  |  |  |  |  |  | 66,027 us-gaap_DirectPremiumsEarned | 44,530 us-gaap_DirectPremiumsEarned | 34,028 us-gaap_DirectPremiumsEarned
Assumed |  |  |  |  |  |  |  |  | 1,450,047 us-gaap_AssumedPremiumsEarned | 1,482,511 us-gaap_AssumedPremiumsEarned | 1,465,701 us-gaap_AssumedPremiumsEarned
Ceded |  |  |  |  |  |  |  |  | (453,658)us-gaap_CededPremiumsEarned | (412,415)us-gaap_CededPremiumsEarned | (430,374)us-gaap_CededPremiumsEarned
Net premiums earned (Note 7) | 256,487 us-gaap_PremiumsEarnedNet | 258,979 us-gaap_PremiumsEarnedNet | 260,416 us-gaap_PremiumsEarnedNet | 286,534 us-gaap_PremiumsEarnedNet | 256,765 us-gaap_PremiumsEarnedNet | 294,717 us-gaap_PremiumsEarnedNet | 291,889 us-gaap_PremiumsEarnedNet | 271,255 us-gaap_PremiumsEarnedNet | 1,062,416 us-gaap_PremiumsEarnedNet | 1,114,626 us-gaap_PremiumsEarnedNet | 1,069,355 us-gaap_PremiumsEarnedNet
Claims and claim expenses |  |  |  |  |  |  |  |  |  |  |
Gross claims and claim expenses incurred |  |  |  |  |  |  |  |  | 228,581 us-gaap_PolicyholderBenefitsAndClaimsIncurredGross | 185,139 us-gaap_PolicyholderBenefitsAndClaimsIncurredGross | 403,491 us-gaap_PolicyholderBenefitsAndClaimsIncurredGross
Claims and claim expenses recovered |  |  |  |  |  |  |  |  | (30,634)us-gaap_ReinsuranceCostsAndRecoveriesNet | (13,852)us-gaap_ReinsuranceCostsAndRecoveriesNet | (78,280)us-gaap_ReinsuranceCostsAndRecoveriesNet
Net claims and claim expenses incurred | $ (12,003)us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 69,647 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 81,388 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 58,915 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ (20,854)us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 60,928 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 103,962 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 27,251 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 197,947 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 171,287 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 325,211 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet

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