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Voyage revenues (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross trade accounts receivable $ 43,227    
Increase (Decrease) in Deferred Revenue 13,285 $ 4,301 $ (3,481)
Increase (Decrease) in Prepaid Expense and Other Assets (19,012) (2,211) (14,940)
Other Assets, Current 15,217 12,991  
Deferred Revenue, Current 24,960 11,675  
Voyage revenues 1,427,423 693,241 821,365
Revenues 1,427,423 693,241 821,365
Charter In Vessels [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 20,215 36,234 185,311
Sublease Income 1,212 243 15,253
Revenue Contracts [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Increase (Decrease) in Prepaid Expense and Other Assets 2,736    
Other Assets, Current 4,923 2,187  
Vessels Operating in CCL Pool [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Voyage revenues (4,188) (3,695) $ 9,524
Vessels Operating In Short Pool [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Voyage revenues (328) $ 1,923  
Vessels Operating With Other Parties [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Voyage revenues $ 3,351