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Fair value measurements - Fair Value Measurements (Table) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value Measurements [Line Items]      
Vessel impairment loss $ 0 $ 303,219 $ 62,020
Star Ypsilon
      
Fair Value Measurements [Line Items]      
Vessel value   11,152  
Vessel impairment loss     30,754
Star Sigma
      
Fair Value Measurements [Line Items]      
Vessel value 8,354    
Vessel impairment loss   3,205 31,266
Star Cosmo
      
Fair Value Measurements [Line Items]      
Vessel impairment loss   45,838  
Star Delta
      
Fair Value Measurements [Line Items]      
Vessel impairment loss   35,836  
Star Epsilon
      
Fair Value Measurements [Line Items]      
Vessel impairment loss   36,756  
Star Gamma
      
Fair Value Measurements [Line Items]      
Vessel impairment loss   36,033  
Star Kappa
      
Fair Value Measurements [Line Items]      
Vessel impairment loss   39,115  
Star Omicron
      
Fair Value Measurements [Line Items]      
Vessel impairment loss   39,841  
Star Theta
      
Fair Value Measurements [Line Items]      
Vessel impairment loss   36,784  
Star Zeta
      
Fair Value Measurements [Line Items]      
Vessel impairment loss   29,811  
Significant Other Observable Inputs (Level 2)
      
Fair Value Measurements [Line Items]      
Vessel value   123,500 25,500
Significant Other Observable Inputs (Level 2) | Star Ypsilon
      
Fair Value Measurements [Line Items]      
Vessel value     11,500
Significant Other Observable Inputs (Level 2) | Star Sigma
      
Fair Value Measurements [Line Items]      
Vessel value   9,000 14,000
Significant Other Observable Inputs (Level 2) | Star Cosmo
      
Fair Value Measurements [Line Items]      
Vessel value   14,000  
Significant Other Observable Inputs (Level 2) | Star Delta
      
Fair Value Measurements [Line Items]      
Vessel value   12,000  
Significant Other Observable Inputs (Level 2) | Star Epsilon
      
Fair Value Measurements [Line Items]      
Vessel value   13,000  
Significant Other Observable Inputs (Level 2) | Star Gamma
      
Fair Value Measurements [Line Items]      
Vessel value   14,000  
Significant Other Observable Inputs (Level 2) | Star Kappa
      
Fair Value Measurements [Line Items]      
Vessel value   13,500  
Significant Other Observable Inputs (Level 2) | Star Omicron
      
Fair Value Measurements [Line Items]      
Vessel value   17,750  
Significant Other Observable Inputs (Level 2) | Star Theta
      
Fair Value Measurements [Line Items]      
Vessel value   15,000  
Significant Other Observable Inputs (Level 2) | Star Zeta
      
Fair Value Measurements [Line Items]      
Vessel value   $ 15,250