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Document And Entity Information
 12 Months Ended
Dec. 31, 2019
shares
Document And Entity Information [Abstract]  
Document Type 20-F
Document Period End Date Dec. 31, 2019
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 Common Stock Shares Outstanding 96,066,226
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Trading Symbol SBLK
Entity Interactive Data Current Yes
Entity Address, Country MH
Document Annual Report true
Security 12b Title Common Shares, par value $0.01 per share and 8.30% Senior Notes due 2022
Document Transition Report false
Document Shell Company Report false