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Document And Entity Information
 12 Months Ended
Dec. 31, 2018
shares
Document And Entity Information [Abstract]  
Document Type 20-F
Document Period End Date Dec. 31, 2018
Amendment Flag false
Enity Registrant Name Star Bulk Carriers Corp.
Entity Central Index Key 0001386716
Entity Current Reporting Status Yes
Entity Voluntary Filers No
Current Fiscal Year End Date --12-31
Entity Filer Category Accelerated Filer
Entity Shell Company false
Entity Well Known Seasoned Issuer No
Entity Emerging Growth Company false
Entity Ex Transition Period false
Entity Common Stock Shares Outstanding 92,285,986
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Trading Symbol SBLK