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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