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Other operational gain (Details) - USD ($)
 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 28, 2013
Oct. 03, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Gain Contingencies [Line Items]          
Other operational gain     $ 1,565,000 $ 592,000 $ 10,003,000
Exinguishment of liability related to amount of fuel and lubricants remaining on board     $ 0 0 1,361,000
Star Borealis          
Gain Contingencies [Line Items]          
Proceeds from sale of settled claim   $ 8,016,000      
Gain on sale of claim         9,377,000
Gross daily charter rate $ 24,750        
Exinguishment of liability related to amount of fuel and lubricants remaining on board         1,361,000
Hull and Machinery Insurance Claim and Protection and Indemnity Claim          
Gain Contingencies [Line Items]          
Other operational gain         456,000
Korea Line Corporation, Rehabilitation plan          
Gain Contingencies [Line Items]          
Proceeds from sale of trading securities       $ 550,000  
Rebate from Company's previous manning agent          
Gain Contingencies [Line Items]          
Rebate from previous manning agent         $ 170,000