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Loss and Loss Expense Reserves (Tables)
9 Months Ended
Sep. 30, 2017
Loss and Loss Expense Reserves [Abstract]  
Summary of activity in reserves for losses and loss expenses
Activity in the reserves for losses and loss expenses for the nine months ended September 30, 2017 and 2016 is summarized as follows.  All amounts are shown net of reinsurance, unless otherwise indicated.

  
2017
  
2016
 
Reserves, gross of reinsurance
      
    recoverable, at the beginning of the year
 
$
576,330
  
$
513,596
 
Reinsurance recoverable on unpaid losses at the beginning of the year
  
251,563
   
211,843
 
Reserves at the beginning of the year
  
324,767
   
301,753
 
         
Provision for losses and loss expenses:
        
   Claims occurring during the current period
  
164,546
   
129,404
 
   Claims occurring during prior periods
  
16,480
   
8,712
 
   Total incurred
  
181,026
   
138,116
 
         
Loss and loss expense payments:
        
   Claims occurring during the current period
  
41,616
   
30,932
 
   Claims occurring during prior periods
  
109,616
   
81,427
 
   Total paid
  
151,232
   
112,359
 
Reserves at the end of the period
  
354,561
   
327,510
 
         
Reinsurance recoverable on unpaid losses at the end of the period
  
301,445
   
238,049
 
Reserves, gross of reinsurance
        
    recoverable, at the end of the period
 
$
656,006
  
$
565,559