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Basis of Presentation and General Information - Transaction Agreement DSS (Details) - USD ($)
$ in Thousands
 3 Months Ended 11 Months Ended
Mar. 27, 2019
Nov. 27, 2018
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]    
Reverse unit split, description one for seven reverse unit split  
Transaction Agreement with DSS    
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]    
Closing date of Transaction Agreement Mar. 27, 2019  
Date Of Transaction Agreement   Nov. 27, 2018
Athena renamed to Diamond S | Transaction Agreement with DSS    
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]    
Cash received $ 10,000  
Shares to be distributed 12,725,000  
Partnership contribution of the Crude and Product tanker business the Partnership agreed to contribute to Athena the Crude and Product tanker business, associated inventories, $10,000 in cash plus prorated charter hire and net payments received from February 20, 2019 onwards with specific arrangements relating to the funding of working capital  
DSS loan | Transaction Agreement with DSS    
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]    
Credit facility, maximum borrowing capacity $ 360,000  
Expiration period of line of credit 5 years