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Fair value measurements - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Oct. 01, 2015 | Apr. 28, 2014 | Sep. 30, 2013 | Jun. 30, 2013
Derivative |  |  |  |  |
Amount expected to be reclassified into earnings | $ 814 |  |  |  |
Trading Symbol | SBLK |  |  |  |
Credit Agricole Corporate and Investment Bank $70,000 facility |  |  |  |  |
Derivative |  |  |  |  |
Number of interest rate derivatives held by the Company |  |  |  |  | 2
Credit Agricole Corporate and Investment Bank $70,000 facility | Tranche A |  |  |  |  |
Derivative |  |  |  |  |
Maturity date | Aug. 09, 2018 |  |  |  |
Derivative asset, Notional amount | $ 23,927 |  |  |  | $ 26,840
Fixed rate, per annum |  |  |  |  | 1.705%
Credit Agricole Corporate and Investment Bank $70,000 facility | Tranche B |  |  |  |  |
Derivative |  |  |  |  |
Maturity date | Nov. 09, 2018 |  |  |  |
Derivative asset, Notional amount | $ 25,131 |  |  |  | $ 28,628
Fixed rate, per annum |  |  |  |  | 1.72%
HSH Nordbank AG $35,000 facility |  |  |  |  |
Derivative |  |  |  |  |
Number of interest rate derivatives held by the Company |  |  | 2 |  |
Percentage of debt hedged by interest rate swap agreement |  |  | 50.00% |  |
Maturity date | Sep. 28, 2018 |  |  |  |
Derivative asset, Notional amount | $ 14,781 |  |  |  |
Fixed rate, per annum |  |  | 1.765% |  |
Goldman Sachs |  |  |  |  |
Derivative |  |  |  |  |
Number of interest rate derivatives held by the Company |  |  |  | 5 |
Maturity date | Apr. 01, 2018 |  |  |  |
Derivative asset, Notional amount | $ 431,750 | $ 461,264 |  |  |
Minimum | Goldman Sachs |  |  |  |  |
Derivative |  |  |  |  |
Fixed rate, per annum |  |  |  | 1.79% |
Maximum | Goldman Sachs |  |  |  |  |
Derivative |  |  |  |  |
Fixed rate, per annum |  |  |  | 2.07% |
Quoted Prices in Active Markets for Identical Liabilities (Level 1) |  |  |  |  |
Derivative |  |  |  |  |
8.00% 2019 Notes fair value | $ 33,000 |  |  |  |
8.00% 2019 Notes |  |  |  |  |
Derivative |  |  |  |  |
Trading Symbol | SBLKL |  |  |  |

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