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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Premiums written        
Direct $ 34,340 $ 19,707 $ 65,153 $ 33,562
Assumed 627,657 491,833 1,240,422 1,183,238
Ceded (153,320) (165,133) (392,863) (420,046)
Net premiums written 508,677 346,407 912,712 796,754
Premiums earned        
Direct 21,606 14,949 44,507 29,178
Assumed 468,372 350,389 850,975 735,987
Ceded (110,150) (104,922) (218,894) (218,215)
Net premiums earned 379,828 260,416 676,588 546,950
Claims and claim expenses        
Gross claims and claim expenses incurred 222,819 97,064 311,814 165,214
Claims and claim expenses recovered (53,475) (15,676) (65,617) (24,911)
Net claims and claim expenses incurred $ 169,344 $ 81,388 $ 246,197 $ 140,303