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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
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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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