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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, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Premiums written        
Direct $ 19,707 $ 16,333 $ 33,562 $ 26,650
Assumed 491,833 686,890 1,183,238 1,311,991
Ceded (165,133) (144,114) (420,046) (342,719)
Net premiums written 346,407 559,109 796,754 995,922
Premiums earned        
Direct 14,949 10,789 29,178 20,662
Assumed 350,389 380,626 735,987 747,479
Ceded (104,922) (99,526) (218,215) (204,997)
Net premiums earned 260,416 291,889 546,950 563,144
Claims and claim expenses        
Gross claims and claim expenses incurred 97,064 116,995 165,214 150,993
Claims and claim expenses recovered (15,676) (13,033) (24,911) (19,780)
Net claims and claim expenses incurred $ 81,388 $ 103,962 $ 140,303 $ 131,213