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Voyage expenses and vessel operating expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Voyage expenses:      
Commissions $ 6,781 $ 6,134 $ 4,278
Bunkers 5,418 7,365 4,204
Port expenses 2,246 1,819 1,633
Other 475 918 583
Total 14,920 16,236 10,698
Vessel operating expenses:      
Crew costs and related costs 39,266 34,385 22,575
Insurance expense 6,529 5,261 4,029
Spares, repairs, maintenance and other expenses 13,871 8,103 6,784
Stores and lubricants 9,818 7,512 5,288
Management fees (Note 4) 11,337 9,610 6,295
Other operating expenses 4,868 2,589 2,151
Total $ 85,689 $ 67,460 $ 47,122