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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
	Mar. 31, 2015	Mar. 31, 2014
Premiums written
Direct	$ 30,813us-gaap_DirectPremiumsWritten	$ 13,855us-gaap_DirectPremiumsWritten
Assumed	612,765us-gaap_AssumedPremiumsWritten	691,405us-gaap_AssumedPremiumsWritten
Ceded	(239,543)us-gaap_CededPremiumsWritten	(254,913)us-gaap_CededPremiumsWritten
Net premiums written	404,035us-gaap_PremiumsWrittenNet	450,347us-gaap_PremiumsWrittenNet
Premiums earned
Direct	22,901us-gaap_DirectPremiumsEarned	14,229us-gaap_DirectPremiumsEarned
Assumed	382,603us-gaap_AssumedPremiumsEarned	385,598us-gaap_AssumedPremiumsEarned
Ceded	(108,744)us-gaap_CededPremiumsEarned	(113,293)us-gaap_CededPremiumsEarned
Net premiums earned	296,760us-gaap_PremiumsEarnedNet	286,534us-gaap_PremiumsEarnedNet
Claims and claim expenses
Gross claims and claim expenses incurred	88,995us-gaap_PolicyholderBenefitsAndClaimsIncurredGross	68,150us-gaap_PolicyholderBenefitsAndClaimsIncurredGross
Claims and claim expenses recovered	(12,142)us-gaap_ReinsuranceCostsAndRecoveriesNet	(9,235)us-gaap_ReinsuranceCostsAndRecoveriesNet
Net claims and claim expenses incurred	$ 76,853us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	$ 58,915us-gaap_PolicyholderBenefitsAndClaimsIncurredNet

X

- Definition

Amount of earned premiums assumed from other entities.

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-Number 210

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