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Prepayments
 12 Months Ended
Dec. 31, 2017
Prepayments [Abstract]  
Prepayments
10
Prepayments
 
Prepayments at December 31, 2017 and 2016, are summarized as follows:
 
  
2017
  
2016
 
Prepaid expenses
 
$
4,775
  
$
7,258
 
Prepaid insurance premiums
  
4,328
   
1,672
 
Fleet insurance
  
2,424
   
6,350
 
  
$
11,527
  
$
15,280