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Prepaid charter revenue, detail (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Movement In Intangible Assets [Roll Forward]    
Time charter aquired, gross, beginning balance $ 33,500  
Time charter aquired, additions 6,000  
Time charter aquired, gross, ending balance 39,500  
Movement In Accumulated Amortization Of Finite Lived Intangible Assets [Roll Forward]    
Time charter aquired, accumulated amortization, beginning balance (27,136)  
Prepaid charter revenue amortization (4,482) $ (5,825)
Time charter aquired, accumulated amortization, ending balance (31,618)  
Prepaid Charter Revenue Net [Abstract]    
Time charter acquired, net, beginning balance 6,364  
Time charter acquired, net, ending balance $ 7,882