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Long-term Debt (Details)
 4 Months Ended 6 Months Ended
May 03, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jul. 31, 2018
USD ($)
May 31, 2018
USD ($)
Feb. 28, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]              
Loan reference interest rate   LIBOR          
Repayments of debt   $ 108,722,000 $ 5,190,000        
Write off of unamortized issuance costs   (21,000) (358,000)        
Cash and cash equivalents   218,651,000         $ 257,911,000
Restricted cash   $ 10,425,000 $ 12,120,000       7,169,000
Weighted average interest rate   5.40% 4.58%        
8.30% 2022 Notes              
Debt Instrument [Line Items]              
Unamortized deferred financing fees   $ 1,797,000         2,000,000
Not legally restricted              
Debt Instrument [Line Items]              
Cash and cash equivalents   52,463,000         51,359,000
Legally restricted              
Debt Instrument [Line Items]              
Restricted cash   $ 21,845,000         $ 15,589,000
NBG $30,000 Facility              
Debt Instrument [Line Items]              
Initiation date   Apr. 19, 2018          
Maximum borrowing capacity   $ 30,000,000          
Maturity date   Dec. 31, 2022          
Number of installments   19          
Frequency of payments   quarterly          
Date of first required payment   Aug. 31, 2018          
Repayment installment   $ 950,000          
Balloon installment   $ 11,950,000          
Vessels provided as collateral   The NBG $30,000 Facility is secured by a first priority mortgage on the vessels previously pledged under Commerzbank $120,000 Facility (Star Aurora, Star Gamma, Star Delta, Star Epsilon, Star Theta and Star Iris)          
Line of credit facility, description   For the refinancing of the Commerzbank $120,000 Facility          
Commerzbank $120,000 Facilitiy              
Debt Instrument [Line Items]              
Repayments of debt $ 34,726,000            
Write off of unamortized issuance costs $ 21,000            
DNB $310,000 Facility              
Debt Instrument [Line Items]              
Initiation date   Apr. 30, 2018          
Maximum borrowing capacity   $ 310,000,000          
Vessels provided as collateral   The loan will be secured by a first priority mortgage on the vessels previously pledged under the refinanced facilities          
DNB $310,000 Facility | Tranche A              
Debt Instrument [Line Items]              
Proceeds from issuance of debt   $ 240,000,000          
Number of installments   20          
Frequency of payments   quarterly          
Repayment installment   $ 8,696,000          
Balloon installment   $ 66,087,000          
Line of credit facility, description   The tranche of $240,000 will be used to refinance the remaining aggregate outstanding amount under the ABN $87,458 Facility, the DNB-SEB-CEXIM $227,500 Facility, the DNB $120,000 Facility, the Deutsche Bank AG $39,000 Facility and the ABN AMRO Bank N.V. $30,844 Facility, respectively.          
DNB $310,000 Facility | Tranche B              
Debt Instrument [Line Items]              
Proceeds from issuance of debt   $ 70,000,000          
Number of installments   12          
Frequency of payments   quarterly          
Repayment installment, percentage   5.55%          
Line of credit facility, description   The tranche of $70,000 will be used for working capital purposes.          
ING $45,000 Facility              
Debt Instrument [Line Items]              
Initiation date   Apr. 30, 2018          
Maximum borrowing capacity   $ 45,000,000          
Number of installments   28          
Frequency of payments   quarterly          
Repayment installment   $ 937,500          
Balloon installment   $ 18,750,000          
Vessels provided as collateral   The facility will be secured by a first priority mortgage on the vessels previously pledged under the refinanced Deutsche Bank $85,000 Facility.          
Line of credit facility, description   The "ING $45,000 Facility" will be used to refinance the outstanding amount under the Deutsche Bank $85,000 Facility.          
Citi $130,000 Facility              
Debt Instrument [Line Items]              
Initiation date   Apr. 30, 2018          
Maximum borrowing capacity   $ 130,000,000          
Number of installments   20          
Frequency of payments   quarterly          
Repayment installment   $ 3,650,000          
Balloon installment   $ 57,000,000          
Vessels provided as collateral   The Citi $130,000 Facility will be secured by a first priority mortgage on the vessels previously pledged under the refinanced Citi Facility and the 5 applicable Augustea Vessels.          
Line of credit facility, description   The "Citi $130,000 Facility" will be used to refinance in full the approximately $65,000 outstanding under the Citi Facility and provide approximately $65,000 to refinance the existing indebtedness of five of the Augustea Vessels.          
CreditAgricole $43,000 Facility              
Debt Instrument [Line Items]              
Initiation date   Jun. 30, 2018          
Maximum borrowing capacity   $ 43,000,000          
Number of installments   20          
Frequency of payments   quarterly          
Repayment installment   $ 625,000          
Balloon installment   $ 9,000,000          
Vessels provided as collateral   The facility will be secured by the two vessels previously securing the Credit Agricole $70,000 Facility.          
Line of credit facility, description   The "Credit Agricole $43,000 Facility" will be used to refinance the outstanding amount under the Credit Agricole $70,000 Facility.          
Number of loan tranches   2          
Restructuring Letter Agreements              
Debt Instrument [Line Items]              
Prepayment amount       $ 22,723,000 $ 30,000,000 $ 35,632,000