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Long-term bank debt, current and non current, textuals 1 (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2012
Dec. 31, 2014
Line Of Credit Facility [Line Items]      
Current portion of bank debt $ 6,000   $ 6,000
Long-term portion of bank debt $ 92,700   $ 92,700
Rbs Credit Facility [Member]      
Line Of Credit Facility [Line Items]      
Line of credit facility, initiation date Dec. 16, 2011    
Line of credit facility, maximum borrowing capacity $ 100,000    
Line of credit facility 98,700    
Commitment fee percentage   0.99%  
Line of credit facility remaining borrowing capacity $ 0    
Debt instrument, maturity date, description 5 years    
Line of credit facility age limit of vessels 20 years    
Debt instrument maturity date Jan. 17, 2017    
Line of credit facility, interest rate description Libor    
Loan margin percentage 3.10% 2.75%  
Line of credit facility, priority first priority mortgages over certain vessels of fleet    
Restricted cash description security interest on the minimum cash held by the borrower in favour of the lenders minimum cash of 10% of the drawings under the revolving credit facility, but not less than $5,000  
Line of credit facility dividend restrictions The Company is not permitted to pay any dividends that would result in a breach of the financial covenants of the facility.    
Covenant breach, prepayment waived by lenders $ 8,521    
Rbs Credit Facility [Member] | Minimum [Member]      
Line Of Credit Facility [Line Items]      
Borrower minimum liquidity percentage 10.00%    
Borrower minimum liquidity $ 5,000