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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, 2014	Mar. 31, 2013
Premiums written
Direct	$ 13,855	$ 10,317
Assumed	691,405	625,101
Ceded	(254,913)	(198,605)
Net premiums written	450,347	436,813
Premiums earned
Direct	14,229	9,873
Assumed	385,598	366,853
Ceded	(113,293)	(105,471)
Net premiums earned	286,534	271,255
Claims and claim expenses
Gross claims and claim expenses incurred	68,150	33,998
Claims and claim expenses recovered	(9,235)	(6,747)
Net claims and claim expenses incurred	$ 58,915	$ 27,251

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