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Advances for vessels under construction and acquisition of vessels (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 03, 2018
USD ($)
Jan. 31, 2017
Jun. 30, 2016
Vessels [Line Items]            
Proceeds from cancellation of vessels under construction $ 0 $ 0 $ 5,800      
Impairment loss 0 29,221 $ 321,978      
Other Assets Current 5,157 6,447        
Prepaid expenses and other receivables $ 4,215 $ 5,641        
Two newbuilding contracts            
Vessels [Line Items]            
Number of newbuilding contracts terminated   2        
Impairment loss   $ 1,068        
Behemoth and Bruno Marks            
Vessels [Line Items]            
Number of vessels delivered         2  
Jenmark, Star Aries and Star Taurus            
Vessels [Line Items]            
Number of vessels delivered           3
Newbuilding Vessels or Lease Agreements            
Vessels [Line Items]            
Number of contracts for Newbuildings acquired 3          
Total aggregate remaining contracted price plus agreed additional amounts $ 103,492          
Star Eleni (ex HN-1342)            
Vessels [Line Items]            
Description of Capital leases, Term of contract Bareboat charter for ten years          
Capital leased assets, Number of vessels 1          
Star Eleni (ex HN-1342) | Financed by SWS owner            
Vessels [Line Items]            
Vessel purchase price obligation $ 9,000          
Star Eleni (ex HN-1342) | Financed by CSSC | Subsequent Event            
Vessels [Line Items]            
Capital lease obligation recognised       $ 30,000    
Financed through bareboat capital lease arrangements | Two newbuilding contracts            
Vessels [Line Items]            
Newbuildings periodic installments, next twelve months 69,984          
Refund receivable from the shipyards            
Vessels [Line Items]            
Other Assets Current $ 1,604