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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 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Premiums written                      
Direct                 $ 130,681 $ 76,511 $ 54,334
Assumed                 1,880,629 1,474,061 1,551,078
Ceded                 (595,127) (482,336) (401,465)
Net premiums written $ 236,651 $ 266,820 $ 508,677 $ 404,035 $ 111,769 $ 159,713 $ 346,407 $ 450,347 1,416,183 1,068,236 1,203,947
Premiums earned                      
Direct                 98,182 66,027 44,530
Assumed                 1,769,088 1,450,047 1,482,511
Ceded                 (466,719) (453,658) (412,415)
Net premiums earned 361,575 362,388 379,828 296,760 256,487 258,979 260,416 286,534 1,400,551 1,062,416 1,114,626
Claims and claim expenses                      
Gross claims and claim expenses incurred                 544,972 228,581 185,139
Claims and claim expenses recovered                 (96,734) (30,634) (13,852)
Net claims and claim expenses incurred $ 102,013 $ 100,028 $ 169,344 $ 76,853 $ (12,003) $ 69,647 $ 81,388 $ 58,915 $ 448,238 $ 197,947 $ 171,287