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Reserve For Losses, LAE And Future Policy Benefit Reserve (Tables)
 12 Months Ended
Dec. 31, 2015
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]  
Summary Of Activity In The Reserve For Losses And LAE
   
At December 31,
  
(Dollars in thousands)
  
2015
    
2014
    
2013
  
Gross reserves at January 1
  
$
9,720,813
    
$
9,673,240
    
$
10,069,055
  
      Less reinsurance recoverables
    
(627,082
)
    
(473,866
)
    
(602,750
)
           Net reserves at January 1
    
9,093,731
      
9,199,374
      
9,466,305
  
                         
Incurred related to:
                        
      Current year
    
3,170,482
      
2,946,396
      
2,818,490
  
      Prior years
    
(68,567
)
    
(39,862
)
    
(18,239
)
           Total incurred losses and LAE
    
3,101,915
      
2,906,534
      
2,800,251
  
                         
Paid related to:
                        
      Current year
    
697,778
      
761,788
      
664,719
  
      Prior years
    
2,186,274
      
2,089,734
      
2,353,817
  
           Total paid losses and LAE
    
2,884,052
      
2,851,522
      
3,018,536
  
                         
Foreign exchange/translation adjustment
    
(190,032
)
    
(160,655
)
    
(48,646
)
                         
Net reserves at December 31
    
9,121,562
      
9,093,731
      
9,199,374
  
      Plus reinsurance recoverables
    
830,236
      
627,082
      
473,866
  
           Gross reserves at December 31
  
$
9,951,798
    
$
9,720,813
    
$
9,673,240
  
Summary Of Incurred Losses With Respect To A&E Reserve On Both Gross And Net Of Reinsurance Basis
   
At December 31,
  
(Dollars in thousands)
  
2015
    
2014
    
2013
  
Gross basis:
            
Beginning of period reserves
  
$
476,205
    
$
402,461
    
$
442,821
  
Incurred losses
    
40,000
      
142,233
      
5,599
  
Paid losses
    
(83,088
)
    
(68,489
)
    
(45,959
)
End of period reserves
  
$
433,117
    
$
476,205
    
$
402,461
  
                         
Net basis:
                        
Beginning of period reserves
  
$
458,211
    
$
386,677
    
$
425,691
  
Incurred losses
    
38,440
      
137,769
      
5,400
  
Paid losses
    
(177,031
)
    
(66,235
)
    
(44,414
)
End of period reserves
  
$
319,620
    
$
458,211
    
$
386,677
  
Summary Of Activity In The Reserve For Future Policy Benefits
   
At December 31,
  
(Dollars in thousands)
  
2015
    
2014
    
2013
  
Balance at beginning of year
  
$
59,820
    
$
59,512
    
$
66,107
  
Liabilities assumed
    
315
      
250
      
103
  
Adjustments to reserves
    
2,310
      
4,724
      
(3,066
)
Benefits paid in the current year
    
(3,535
)
    
(4,667
)
    
(3,632
)
Balance at end of year
  
$
58,910
    
$
59,820
    
$
59,512
  
                         
(Some amounts may not reconcile due to rounding.)