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Segment Information
 6 Months Ended
Jun. 30, 2018
Segment Information [Abstract]  
Segment Information
(5) Segment Information:
The Company has one reportable business segment in its operations: Property and Casualty Insurance.  The property and casualty insurance segment provides multiple lines of insurance coverage primarily to fleet transportation companies as well as to independent contractors who contract with fleet transportation companies.  In addition, the Company provides workers' compensation coverage for a variety of classes outside the transportation industry.

The following table summarizes segment revenues for the three and six months ended June 30, 2018 and 2017:

  
Three Months Ended
  
Six Months Ended
 
  
June 30
  
June 30
 
  
2018
  
2017
  
2018
  
2017
 
             
Revenues:
            
Net premiums earned
 
$
111,940
  
$
67,996
  
$
217,402
  
$
141,971
 
Net investment income
  
5,796
   
4,716
   
10,432
   
8,408
 
Net realized and unrealized gains (losses) on investments
  
(3,435
)
  
3,296
   
(7,968
)
  
9,590
 
Commissions and other income
  
2,263
   
1,400
   
4,076
   
2,380
 
Total revenues
 
$
116,564
  
$
77,408
  
$
223,942
  
$
162,349