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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Premiums written        
Direct $ 20,481 $ 12,198 $ 54,043 $ 38,848
Assumed 180,511 170,451 1,363,749 1,482,442
Ceded (41,279) (55,408) (461,325) (398,127)
Net premiums written 159,713 127,241 956,467 1,123,163
Premiums earned        
Direct 18,101 11,395 47,279 32,057
Assumed 354,142 387,194 1,090,129 1,134,673
Ceded (113,264) (103,872) (331,479) (308,869)
Net premiums earned 258,979 294,717 805,929 857,861
Claims and claim expenses        
Gross claims and claim expenses incurred 76,973 66,712 242,187 217,705
Claims and claim expenses recovered (7,326) (5,784) (32,237) (25,564)
Net claims and claim expenses incurred $ 69,647 $ 60,928 $ 209,950 $ 192,141