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Voyage revenues (Details Narrative) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Decrease / (Increase) in trade accounts receivable | $ 20,322 | $ (20,383) | $ (22,266)
Decrease / (Increase) in deferred revenue | (4,301) | 3,481 | (2,489)
Decrease in deferred assets | (2,211) | (14,940) | (7,545)
Other Assets, Current | 12,991 | 11,413 |
Deferred Revenue, Current | 11,675 | 7,374 |
Voyage revenues | 693,241 | 821,365 | 651,561
Revenues | 693,241 | 821,365 | 651,561
Charter In Vessels [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenues | 36,234 | 185,311 | 127,618
Sublease income | 243 | 15,253 | 18,661
Revenue Contracts [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Decrease in deferred assets | 672 |  |
Other Assets, Current | 2,187 | 2,859 |
Vessels Operating in CCL Pool [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Voyage revenues | (3,695) | $ 9,524 | $ 1,126
Vessels Operating In Short Pool [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Voyage revenues | $ 1,923 |  |

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