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Vessels and other fixed assets net - Schedules of vessels and other fixed assets, net (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Balance, period start $ 2,965,527    
Impairment loss $ (3,411) $ (17,784)
Depreciation for the period (142,293) (124,280) (102,852)
Balance, period end 2,877,119 2,965,527  
Cost [Member]      
Property, Plant and Equipment [Line Items]      
Balance, period start 3,410,923 3,105,263  
Transfer from advances for vessels under construction and acquisition of vessels   157,589  
Property, Plant and Equipment, Additions 53,885 335,671  
Vessel disposal/ transfer to Held for sale   (163,049)  
Impairment loss   (24,551)  
Balance, period end 3,464,808 3,410,923 3,105,263
Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance, period start (445,396) (449,155)  
Vessel disposal/ transfer to Held for sale   106,899  
Impairment loss   21,140  
Depreciation for the period (142,293) (124,280)  
Balance, period end (587,689) (445,396) (449,155)
Net Book Value [Member]      
Property, Plant and Equipment [Line Items]      
Balance, period start 2,965,527 2,656,108  
Transfer from advances for vessels under construction and acquisition of vessels   157,589  
Property, Plant and Equipment, Additions 53,885 335,671  
Vessel disposal/ transfer to Held for sale   (56,150)  
Impairment loss   (3,411)  
Depreciation for the period (142,293) (124,280)  
Balance, period end $ 2,877,119 $ 2,965,527 $ 2,656,108