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Schedule IV - Reinsurance
 12 Months Ended
Dec. 31, 2016
Schedule IV - Reinsurance [Abstract]  
Schedule IV - Reinsurance
SCHEDULE IV - REINSURANCE
 


Column A
  
Column B
    
Column C
    
Column D
    
Column E
    
Column F
  
         
Ceded to
    
Assumed
              
   
Gross
    
Other
    
from Other
    
Net
    
Assumed
  
(Dollars in thousands)
  
Amount
    
Companies
    
Companies
    
Amount
    
to Net
  
                               
December 31, 2016
                              
Total property and liability
                              
insurance premiums earned
  
$
1,608,783
    
$
3,007,332
    
$
3,492,598
    
$
2,094,049
      
166.8
%
                                         
December 31, 2015
                                        
Total property and liability
                                        
insurance premiums earned
  
$
1,439,795
    
$
2,933,519
    
$
3,637,484
    
$
2,143,760
      
169.7
%
                                         
December 31, 2014
                                        
Total property and liability
                                        
insurance premiums earned
  
$
1,148,297
    
$
2,720,355
    
$
3,685,784
    
$
2,113,726
      
174.4
%