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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Premiums written        
Direct $ 67,805 $ 57,541 $ 141,213 $ 100,717
Assumed 759,610 701,587 1,608,292 1,520,544
Ceded (271,670) (239,212) (649,624) (589,670)
Net premiums written 555,745 519,916 1,099,881 1,031,591
Premiums earned        
Direct 56,357 37,936 114,525 71,076
Assumed 520,347 464,540 1,019,346 921,181
Ceded (194,439) (151,074) (385,561) (287,249)
Net premiums earned 382,265 351,402 748,310 705,008
Claims and claim expenses        
Gross claims and claim expenses incurred 189,903 224,852 441,707 386,850
Claims and claim expenses recovered (47,316) (57,102) (106,039) (92,495)
Net claims and claim expenses incurred $ 142,587 $ 167,750 $ 335,668 $ 294,355