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Document And Entity Information
 12 Months Ended
Dec. 31, 2012
Document And Entity Information [Abstract]  
Document Type 20-F
Document Period End Date Dec. 31, 2012
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 Well Known Seasoned Issuer No
Entity Common Stock Shares Outstanding 5,400,810
Document Fiscal Year Focus 2012
Document Fiscal Period Focus FY