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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  
Athena renamed to Diamond S    
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]    
Cash received $ 10,000  
Shares to be distributed 12,725,000  
Transaction Agreement with DSS    
Subsidiary Of Limited Liability Company Or Limited Partnership [Line Items]    
Closing date of Transaction Agreement Mar. 27, 2019  
Credit facility, maximum borrowing capacity $ 360,000  
Expiration period of line of credit 5 years  
Date Of Transaction Agreement   Nov. 27, 2018