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Transactions with Related Parties - Additional Information - Interchart (Details) - Interchart Shipping Inc. - USD ($)
$ in Thousands
2 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2014
Related Party Transaction [Line Items]      
Percentage of total outstanding common shares     33.00%
Services Agreement      
Related Party Transaction [Line Items]      
Monthly lump sum fee   $ 275  
Expiration date of agreement   Dec. 31, 2018  
New Service Agreement      
Related Party Transaction [Line Items]      
Monthly lump sum fee $ 325    
Expiration date of agreement Dec. 31, 2019