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Vessels, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Net, Beginning Balance $ 1,062,258    
Additions (56,050) $ (53,255) $ (58,334)
Vessels impairment loss (71,577) (36,680) (44,344)
Property, Plant and Equipment, Net, Ending Balance 1,041,138 1,062,258  
Vessels [Member] | Cost [Member]      
Property, Plant and Equipment [Line Items]      
Balance 1,370,756 1,360,231 1,420,078
Additions 110,416 113,391 115,902
Disposals (5,233) (5,696) (76,264)
Vessels impairment loss (161,199) (97,170) (99,485)
Property, Plant and Equipment, Gross, Ending Balance 1,314,740 1,370,756 1,360,231
Vessels [Member] | Accumulated Depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance (308,498) (316,981) (321,063)
Additions (54,884) (52,088) (54,585)
Disposals 158 81 0
Vessels impairment loss 89,622 60,490 58,667
Balance (273,602) (308,498) (316,981)
Vessels [Member] | Net Book Value [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Net, Beginning Balance 1,062,258 1,043,250 1,099,015
Additions 55,532 61,303 61,317
Disposals (5,075) (5,615) (76,264)
Vessels impairment loss (71,577) (36,680) (40,818)
Property, Plant and Equipment, Net, Ending Balance $ 1,041,138 $ 1,062,258 $ 1,043,250