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Voyage revenues (Table) (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Voyage revenues | $ 324,282 | $ 253,661
Time charters |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Voyage revenues | 176,709 | 152,079
Voyage charters |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Voyage revenues | 145,443 | 99,029
Pool revenues |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Voyage revenues | $ 2,130 | $ 2,553

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- Definition Revenues arising from services provided to charterers according to the terms and conditions included in charter agreements. Voyage revenues may include the amortization of above/below market acquired time charter. + References No definition available. + Details
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Namespace Prefix: | sblk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=sblk_VoyageContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |