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Advances for vessel acquisitions and Vessels, net - Vessels, net in the accompanying consolidated balance sheets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Vessel Cost    
Property and Equipment, Beginning Balance $ 872,431,000 $ 1,096,534,000
Additions to vessels cost 1,106,000 6,001,000
Additions reclassified from other non-current assets 441,000 2,474,000
Vessel transferred from held for sale   7,130,000
Impairment   (199,605,000)
Vessel disposals (16,120,000) (16,742,000)
Vessel transferred to held for sale   (23,361,000)
Vessels contributed to OceanPal (47,429,000)  
Property and Equipment, Ending Balance 810,429,000 872,431,000
Accumulated Depreciation    
Beginning Balance (156,253,000) (214,237,000)
Impairment   96,681,000
Vessel disposals 7,110,000 34,000
Vessels contributed to OceanPal 17,127,000  
Depreciation for the year (34,963,000) (38,731,000)
Ending Balance (166,979,000) (156,253,000)
Net Book Value    
Property And Equipment Net, Beginning Balance 716,178,000 882,297,000
Additions to vessels cost 1,106,000 6,001,000
Additions reclassified from other non-current assets 441,000 2,474,000
Vessel transferred from held for sale   7,130,000
Impairment 0 (102,924,000)
Vessel disposal (9,010,000) (16,708,000)
Vessel transferred to held for sale   (23,361,000)
Vessels contributed to OceanPal (30,302,000)  
Depreciation for the year (34,963,000) (38,731,000)
Property And Equipment Net, Ending Balance 643,450,000 716,178,000
Additions for vessel improvements $ 1,547,000 $ 8,475,000