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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

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