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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
	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									$ 76,511us-gaap_DirectPremiumsWritten	$ 54,334us-gaap_DirectPremiumsWritten	$ 36,367us-gaap_DirectPremiumsWritten
Assumed									1,474,061us-gaap_AssumedPremiumsWritten	1,551,078us-gaap_AssumedPremiumsWritten	1,515,224us-gaap_AssumedPremiumsWritten
Ceded									(482,336)us-gaap_CededPremiumsWritten	(401,465)us-gaap_CededPremiumsWritten	(448,934)us-gaap_CededPremiumsWritten
Net premiums written	111,769us-gaap_PremiumsWrittenNet	159,713us-gaap_PremiumsWrittenNet	346,407us-gaap_PremiumsWrittenNet	450,347us-gaap_PremiumsWrittenNet	80,784us-gaap_PremiumsWrittenNet	127,241us-gaap_PremiumsWrittenNet	559,109us-gaap_PremiumsWrittenNet	436,813us-gaap_PremiumsWrittenNet	1,068,236us-gaap_PremiumsWrittenNet	1,203,947us-gaap_PremiumsWrittenNet	1,102,657us-gaap_PremiumsWrittenNet
Premiums earned
Direct									66,027us-gaap_DirectPremiumsEarned	44,530us-gaap_DirectPremiumsEarned	34,028us-gaap_DirectPremiumsEarned
Assumed									1,450,047us-gaap_AssumedPremiumsEarned	1,482,511us-gaap_AssumedPremiumsEarned	1,465,701us-gaap_AssumedPremiumsEarned
Ceded									(453,658)us-gaap_CededPremiumsEarned	(412,415)us-gaap_CededPremiumsEarned	(430,374)us-gaap_CededPremiumsEarned
Net premiums earned (Note 7)	256,487us-gaap_PremiumsEarnedNet	258,979us-gaap_PremiumsEarnedNet	260,416us-gaap_PremiumsEarnedNet	286,534us-gaap_PremiumsEarnedNet	256,765us-gaap_PremiumsEarnedNet	294,717us-gaap_PremiumsEarnedNet	291,889us-gaap_PremiumsEarnedNet	271,255us-gaap_PremiumsEarnedNet	1,062,416us-gaap_PremiumsEarnedNet	1,114,626us-gaap_PremiumsEarnedNet	1,069,355us-gaap_PremiumsEarnedNet
Claims and claim expenses
Gross claims and claim expenses incurred									228,581us-gaap_PolicyholderBenefitsAndClaimsIncurredGross	185,139us-gaap_PolicyholderBenefitsAndClaimsIncurredGross	403,491us-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	$ 69,647us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 81,388us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 58,915us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ (20,854)us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 60,928us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 103,962us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 27,251us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 197,947us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 171,287us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 325,211us-gaap_PolicyholderBenefitsAndClaimsIncurredNet

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