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Long-term Debt (Details)
$ in Thousands
 6 Months Ended
Jul. 07, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 27, 2017
USD ($)
Jun. 30, 2016
USD ($)
Aug. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Long-term debt [Line Items]              
Cash and cash equivalents   $ 226,882   $ 140,555   $ 181,758 $ 208,056
Weighted average interest rate   4.58%   4.00%      
Loan reference interest rate   LIBOR          
Write off of unamortized deferred financing fees   $ 358   $ 1,801      
ABN Amro Bank $30,844 Facility              
Long-term debt [Line Items]              
Issuance date   Jun. 23, 2017          
Face amount   $ 30,844          
Number of loan tranches   2          
ABN Amro Bank $30,844 Facility | Tranche A              
Long-term debt [Line Items]              
Face amount   $ 16,000          
Proceeds from issuance of debt     $ 16,000        
Number of vessels financed   2          
Vessels provided as security   Tranche A is secured by Star Charis and Star Suzanna          
Maturity date   Jun. 30, 2022          
Number of installments   20          
Frequency of payments   quarterly          
Date of first required payment   Sep. 30, 2017          
Balloon installment   $ 6,240          
ABN Amro Bank $30,844 Facility | Tranche A - First 4 installments              
Long-term debt [Line Items]              
Number of installments   4          
Repayment installment   $ 1,000          
ABN Amro Bank $30,844 Facility | Tranche A - Last 16 installments              
Long-term debt [Line Items]              
Number of installments   16          
Repayment installment   $ 360          
ABN Amro Bank $30,844 Facility | Tranche B              
Long-term debt [Line Items]              
Face amount   $ 14,844          
Proceeds from issuance of debt $ 14,844            
Vessels provided as security   Tranche B is secured by Star Angelina and Star Gwyneth          
Maturity date   Jun. 30, 2022          
Number of installments   17          
Frequency of payments   quarterly          
Repayment installment   $ 640          
Date of first required payment   Jul. 30, 2018          
Balloon installment   $ 3,964          
Restructuring Letter Agreements              
Long-term debt [Line Items]              
Prepayment amount         $ 3,635    
Percentage of the equity used for the acquisition of vessels         20.00%    
Star Charis              
Long-term debt [Line Items]              
DWT   81,711          
Delivery date   March 22, 2017          
Star Suzanna              
Long-term debt [Line Items]              
DWT   81,711          
Delivery date   May 15, 2017          
Diva              
Long-term debt [Line Items]              
DWT   56,582          
Delivery date   July 24, 2017          
Two newbuilding contracts              
Long-term debt [Line Items]              
Number of newbuilding contracts terminated       2      
Not legally restricted              
Long-term debt [Line Items]              
Cash and cash equivalents   $ 52,162       47,566  
Legally restricted              
Long-term debt [Line Items]              
Restricted cash   $ 20,540       14,004  
2019 Notes              
Long-term debt [Line Items]              
Maturity date   Nov. 30, 2019          
Unamortized deferred finance fees   $ 1,028       $ 1,243  
First-priority mortgage              
Long-term debt [Line Items]              
Number of vessels   62          
Amount of vessels pledged as collateral   $ 1,465,411          
Cross collateral, Bareboat vessels              
Long-term debt [Line Items]              
Capital leased assets, Number of vessels   8          
Capital leased assets, Net book value   $ 331,248