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Fair Value measurements - Vessel Fair Value (Table) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Star Ypsilon
Mar. 09, 2012
Star Ypsilon
Dec. 31, 2012
Star Sigma
Dec. 31, 2011
Star Sigma
Dec. 31, 2012
Star Cosmo
Dec. 31, 2012
Star Delta
Dec. 31, 2012
Star Epsilon
Dec. 31, 2012
Star Gamma
Dec. 31, 2012
Star Kappa
Dec. 31, 2012
Star Omicron
Dec. 31, 2012
Star Theta
Dec. 31, 2012
Star Zeta
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Dec. 31, 2011
Significant Other Observable Inputs (Level 2)
Dec. 31, 2011
Significant Other Observable Inputs (Level 2)
Star Ypsilon
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Star Sigma
Dec. 31, 2011
Significant Other Observable Inputs (Level 2)
Star Sigma
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Star Cosmo
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Star Delta
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Star Epsilon
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Star Gamma
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Star Kappa
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Star Omicron
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Star Theta
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Star Zeta
Fair Value Measurements [Line Items]                                                        
Vessel value         $ 11,152 $ 8,640                   $ 123,500 $ 25,500 $ 11,500 $ 9,000 $ 14,000 $ 14,000 $ 12,000 $ 13,000 $ 14,000 $ 13,500 $ 17,750 $ 15,000 $ 15,250
Vessel impairment loss $ 303,219 $ 62,020 $ 34,947 $ 30,754   $ 3,205 $ 31,266 $ 45,838 $ 35,836 $ 36,756 $ 36,033 $ 39,115 $ 39,841 $ 36,784 $ 29,811