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Commitments and Contigencies 2 (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 USD ($) | Mar. 31, 2012 EUR (€) | Jun. 28, 2013 USD ($) | Oct. 03, 2014 USD ($) | Nov. 05, 2014 | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 EUR (€) | Jul. 31, 2015 | Jul. 31, 2011 USD ($) | Jul. 31, 2011 EUR (€)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate EUR/USD |  |  |  |  |  | 1.09 |  |  | 1.09 | 1.34 |  |
Decrease in restricted cash |  |  |  |  |  | $ 4,500,000 | $ 35,000 | $ 7,664,000 |  |  |  |
Coverage for pollution |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |
Other operational gain |  |  |  |  |  | 592,000 | 10,003,000 | 3,787,000 |  |  |  |
Exinguishment of liability related to amount of fuel and lubricants remaining on board |  |  |  |  |  | $ 0 | 1,361,000 | $ 0 |  |  |  |
Variable portion of payment to SWS owner |  |  |  |  |  | 6-month LIBOR rate of 0.846% |  |  |  |  |  |
Due to related parties |  |  |  |  |  | $ 422,000 | 2,166,000 |  |  |  |  |
Star Borealis |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross daily charter rate |  |  | $ 24,750 |  |  |  |  |  |  |  |  |
Proceeds from sale of settled claim |  |  |  | $ 8,016,000 |  |  |  |  |  |  |  |
Gain on sale of claim |  |  |  |  |  |  | 9,377,000 |  |  |  |  |
Exinguishment of liability related to amount of fuel and lubricants remaining on board |  |  |  |  |  |  | 1,361,000 |  |  |  |  |
Spanish port authorities environmental fines | Star Cosmo |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash collateral to guarantee the payment of fines |  |  |  |  |  |  |  |  |  |  | $ 371,000 | € 340,000
Cash collateral for pollution release | € |  | € 340,000 |  |  |  |  |  |  |  |  |  |
Fines subject to adjudication |  |  |  |  |  | 283,000 |  |  | € 260,000 |  |  |
Irrevocably adjudicated fines |  |  |  |  |  | $ 65,000 |  |  | € 60,000 |  |  |
Arbitration proceedings | Star Polaris |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Name of defendant |  |  |  |  |  | Hanjin HHIC-Phil Inc. |  |  |  |  |  |
Off hire days | 142 |  |  |  |  |  |  |  |  |  |  |
Revenue loss due to off hire | $ 2,343,000 |  |  |  |  |  |  |  |  |  |  |
Heron Convertible Loan |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  | 0.5 |  |  |  |  |  |  |
Oceanbulk Sellers |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Due to related parties |  |  |  |  |  | $ 50,000 | $ 1,689,000 |  |  |  |  |

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