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Unearned Revenue / Accrued revenue (Tables)
12 Months Ended
Dec. 31, 2018
Deferred Received In Advance And Unearned Revenue  
Unearned Revenue And Cash Received In Advance
Total Unearned Revenue/Accrued Revenue during the periods presented is as follows:

 
 
December 31,
 
 
2017
 
2018
Unearned Revenue
 
 

 
 

Cash received in advance of service provided – Current liability
 
$
3,540

 
$
4,925

Deferred revenue resulting from varying charter rates – Current liability
 


484

Deferred revenue resulting from varying charter rates – Non-Current liability
 


253

Total Unearned Revenue
 
3,540

 
5,662

Accrued Revenue
 
 
 
 
Resulting from revenue earned prior to cash being received – Current asset
 
2,029

 
475

Resulting from varying charter rates – Non-Current asset
 
831

 
614

Total Accrued Revenue
 
2,860

 
1,089