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Unearned Revenue/Accrued Revenue, detail (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Revenue Arrangement [Line Items]    
Cash received in advance of service provided – Current liability $ 5,409 $ 3,540
Deferred revenue resulting from varying charter rates – Non-Current liability 253 0
Total Unearned Revenue 5,662 3,540
Accrued Revenue    
Resulting from revenue earned prior to cash being received – Current asset 475 2,029
Resulting from varying charter rates – Non-Current asset 614 831
Total Accrued Revenue 1,089 2,860
Cash received in advance    
Deferred Revenue Arrangement [Line Items]    
Cash received in advance of service provided – Current liability 4,925 3,540
Deferred revenue resulting from varying charter rates    
Deferred Revenue Arrangement [Line Items]    
Cash received in advance of service provided – Current liability 484 0
Deferred revenue resulting from varying charter rates – Non-Current liability $ 253 $ 0