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Transactions with related parties, textuals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Related Party Transaction [Line Items]      
Due to related parties, current $ 133   $ 136
Altair Travel Agency Sa [Member]      
Related Party Transaction [Line Items]      
Related party transaction, amounts of transaction 579 $ 487  
Due to related parties, current 13   79
Diana Shipping Inc [Member]      
Related Party Transaction [Line Items]      
Due to related parties, current $ 65   57
Debt instrument issuance date May 20, 2013    
Debt instrument face amount $ 50,000    
Debt instrument description of variable rate basis Libor    
Loan margin percentage 5.00%    
Back-end fee percentage 1.25%    
Debt instrument maturity date Aug. 20, 2017    
Interest expense on related party debt $ 1,615 1,610  
Accrued back-end fee on related party debt 1,181   867
Diana Enterprises Inc [Member]      
Related Party Transaction [Line Items]      
Monthly brokerage fee $ 121    
Contract maturity date Mar. 31, 2016    
Related party transaction, amounts of transaction $ 726 $ 725  
Due to related parties, current $ 0   $ 0