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Other non-current assets (Tables)
 6 Months Ended
Jun. 30, 2020
Other non-current assets [Abstract]  
Other Non-Current Assets
As of June 30, 2020 and December 31, 2019, Other non-current assets consisted of the following:

  
June 30,
2020
    
December 31,
2019
  
Nonrefundable deposit
  
$
24,643
    
$
22,262
  
Contract asset (Note 4)
    
23,525
      
19,474
  
Cost to fulfill (Note 4)
    
9,533
      
8,508
  
Unbilled receivables (Note 4)
    
6,643
      
-
  
Upfront payments to customers
    
5,739
      
5,904
  
Port access rights and initial lease costs
    
-
      
17,762
  
Other
    
7,087
      
7,716
  
Total other non-current assets
  
$
77,170
    
$
81,626