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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Premiums written        
Direct $ 31,781 $ 20,481 $ 96,934 $ 54,043
Assumed 337,861 180,511 1,578,283 1,363,749
Ceded (102,822) (41,279) (495,685) (461,325)
Net premiums written 266,820 159,713 1,179,532 956,467
Premiums earned        
Direct 26,040 18,101 70,547 47,279
Assumed 456,957 354,142 1,307,932 1,090,129
Ceded (120,609) (113,264) (339,503) (331,479)
Net premiums earned 362,388 258,979 1,038,976 805,929
Claims and claim expenses        
Gross claims and claim expenses incurred 121,744 76,973 433,558 242,187
Claims and claim expenses recovered (21,716) (7,326) (87,333) (32,237)
Net claims and claim expenses incurred $ 100,028 $ 69,647 $ 346,225 $ 209,950