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Revenues from continuing operations - Disaggregation of revenue (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Total $ 140,865 $ 108,374 $ 117,595
Time charters (operating leases) [Member]      
Disaggregation of Revenue [Line Items]      
Total 137,893 108,374 107,923
Voyage Charters [Member]      
Disaggregation of Revenue [Line Items]      
Total $ 2,972 $ 0 $ 9,672