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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
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Premiums written        
Direct $ 57,541 $ 34,340 $ 100,717 $ 65,153
Assumed 701,587 627,657 1,520,544 1,240,422
Ceded (239,212) (153,320) (589,670) (392,863)
Net premiums written 519,916 508,677 1,031,591 912,712
Premiums earned        
Direct 37,936 21,606 71,076 44,507
Assumed 464,540 468,372 921,181 850,975
Ceded (151,074) (110,150) (287,249) (218,894)
Net premiums earned 351,402 379,828 705,008 676,588
Claims and claim expenses        
Gross claims and claim expenses incurred 224,852 222,819 386,850 311,814
Claims and claim expenses recovered (57,102) (53,475) (92,495) (65,617)
Net claims and claim expenses incurred $ 167,750 $ 169,344 $ 294,355 $ 246,197