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Charter arrangements, Contract Balances (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Contract balances [Abstract]      
Deferred shipping revenues $ 4,865 $ 16,236 $ 930
Capitalized voyage expenses 1,395 1,039 4,151
Impairment losses 0 0 0
Voyage in progress at the end of December 31, 2021 [member]      
Contract balances [Abstract]      
Amortisation expense 1,661    
Voyage in progress at the end of December 31, 2020 [Member]      
Contract balances [Abstract]      
Amortisation expense $ 1,039 397  
Voyage in progress at the end of December 31, 2019 [Member]      
Contract balances [Abstract]      
Amortisation expense   $ 4,151 4,440
Voyage in progress at the end of December 31, 2018 [Member]      
Contract balances [Abstract]      
Amortisation expense     $ 1,633