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Schedule IV - Reinsurance
 12 Months Ended
Dec. 31, 2017
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]  
Schedule IV - Reinsurance
($ thousands)
 
Direct Amount
 
Assumed from Other Companies
 
Ceded to Other Companies
 
Net Amount
 
% of Amount Assumed to Net
2017
 
 

 
 

 
 

 
 

 
 

Premiums earned:
 
 

 
 

 
 

 
 

 
 

Accident and health insurance
 
$
24

 
—

 
24

 
—

 
—

Property and liability insurance
 
2,647,464

 
25,831

 
382,268

 
2,291,027

 
1
%
Total premiums earned
 
2,647,488

 
25,831

 
382,292

 
2,291,027

 
1
%
 
 
 
 
 
 
 
 
 
 
 
2016
 
 

 
 

 
 

 
 

 
 

Premiums earned:
 
 

 
 

 
 

 
 

 
 

Accident and health insurance
 
$
32

 
—

 
—

 
32

 
—

Property and liability insurance
 
2,484,683

 
28,214

 
363,357

 
2,149,540

 
1
%
Total premiums earned
 
2,484,715

 
28,214

 
363,357

 
2,149,572

 
1
%
 
 
 
 
 
 
 
 
 
 
 
2015
 
 

 
 

 
 

 
 

 
 

Premiums earned:
 
 

 
 

 
 

 
 

 
 

Accident and health insurance
 
$
37

 
—

 
37

 
—

 
—

Property and liability insurance
 
2,330,230

 
23,209

 
363,530

 
1,989,909

 
1
%
Total premiums earned
 
2,330,267

 
23,209

 
363,567

 
1,989,909

 
1
%

See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.